feat: Add relative Reminders (#1427)

Partially resolves #1416

Co-authored-by: ce72 <christoph.ernst72@googlemail.com>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/1427
Reviewed-by: konrad <k@knt.li>
Co-authored-by: cernst <ce72@noreply.kolaente.de>
Co-committed-by: cernst <ce72@noreply.kolaente.de>

docs/content/doc/usage/errors.md

@@ -90,6 +90,7 @@ This document describes the different errors Vikunja can return.
 | 4019 | 400 | Invalid task filter value. |
 | 4020 | 400 | The provided attachment does not belong to that task. |
 | 4021 | 400 | This user is already assigned to that task. |
+| 4022 | 400 | The task has a relative reminder which does not specify relative to what. |
 
 ## Namespace
 

pkg/db/fixtures/task_reminders.yml

@@ -6,6 +6,8 @@
   task_id: 27
   reminder: 2018-12-01 01:13:44
   created: 2018-12-01 01:12:04
+  relative_to: 'start_date'
+  relative_period: -3600
 - id: 3
   task_id: 2
   reminder: 2018-12-01 01:13:44

pkg/db/fixtures/tasks.yml

@@ -244,7 +244,7 @@
   created: 2018-12-01 01:12:04
   updated: 2018-12-01 01:12:04
 - id: 27
-  title: 'task #27 with reminders'
+  title: 'task #27 with reminders and start_date'
   done: false
   created_by_id: 1
   project_id: 1
@@ -252,6 +252,7 @@
   bucket_id: 1
   created: 2018-12-01 01:12:04
   updated: 2018-12-01 01:12:04
+  start_date: 2018-11-30 22:25:24
 - id: 28
   title: 'task #28 with repeat after'
   done: false

pkg/integrations/task_collection_test.go

@@ -42,14 +42,14 @@ func TestTaskCollection(t *testing.T) {
 			assert.NoError(t, err)
 			// Not using assert.Equal to avoid having the tests break every time we add new fixtures
 			assert.Contains(t, rec.Body.String(), `task #1`)
-			assert.Contains(t, rec.Body.String(), `task #2`)
+			assert.Contains(t, rec.Body.String(), `task #2 `)
-			assert.Contains(t, rec.Body.String(), `task #3`)
+			assert.Contains(t, rec.Body.String(), `task #3 `)
-			assert.Contains(t, rec.Body.String(), `task #4`)
+			assert.Contains(t, rec.Body.String(), `task #4 `)
-			assert.Contains(t, rec.Body.String(), `task #5`)
+			assert.Contains(t, rec.Body.String(), `task #5 `)
-			assert.Contains(t, rec.Body.String(), `task #6`)
+			assert.Contains(t, rec.Body.String(), `task #6 `)
-			assert.Contains(t, rec.Body.String(), `task #7`)
+			assert.Contains(t, rec.Body.String(), `task #7 `)
-			assert.Contains(t, rec.Body.String(), `task #8`)
+			assert.Contains(t, rec.Body.String(), `task #8 `)
-			assert.Contains(t, rec.Body.String(), `task #9`)
+			assert.Contains(t, rec.Body.String(), `task #9 `)
 			assert.Contains(t, rec.Body.String(), `task #10`)
 			assert.Contains(t, rec.Body.String(), `task #11`)
 			assert.Contains(t, rec.Body.String(), `task #12`)
@@ -75,14 +75,14 @@ func TestTaskCollection(t *testing.T) {
 			rec, err := testHandler.testReadAllWithUser(url.Values{"s": []string{"task #6"}}, urlParams)
 			assert.NoError(t, err)
 			assert.NotContains(t, rec.Body.String(), `task #1`)
-			assert.NotContains(t, rec.Body.String(), `task #2`)
+			assert.NotContains(t, rec.Body.String(), `task #2 `)
-			assert.NotContains(t, rec.Body.String(), `task #3`)
+			assert.NotContains(t, rec.Body.String(), `task #3 `)
-			assert.NotContains(t, rec.Body.String(), `task #4`)
+			assert.NotContains(t, rec.Body.String(), `task #4 `)
-			assert.NotContains(t, rec.Body.String(), `task #5`)
+			assert.NotContains(t, rec.Body.String(), `task #5 `)
-			assert.Contains(t, rec.Body.String(), `task #6`)
+			assert.Contains(t, rec.Body.String(), `task #6 `)
-			assert.NotContains(t, rec.Body.String(), `task #7`)
+			assert.NotContains(t, rec.Body.String(), `task #7 `)
-			assert.NotContains(t, rec.Body.String(), `task #8`)
+			assert.NotContains(t, rec.Body.String(), `task #8 `)
-			assert.NotContains(t, rec.Body.String(), `task #9`)
+			assert.NotContains(t, rec.Body.String(), `task #9 `)
 			assert.NotContains(t, rec.Body.String(), `task #10`)
 			assert.NotContains(t, rec.Body.String(), `task #11`)
 			assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -93,14 +93,14 @@ func TestTaskCollection(t *testing.T) {
 			rec, err := testHandler.testReadAllWithUser(url.Values{"s": []string{"tASk #6"}}, urlParams)
 			assert.NoError(t, err)
 			assert.NotContains(t, rec.Body.String(), `task #1`)
-			assert.NotContains(t, rec.Body.String(), `task #2`)
+			assert.NotContains(t, rec.Body.String(), `task #2 `)
-			assert.NotContains(t, rec.Body.String(), `task #3`)
+			assert.NotContains(t, rec.Body.String(), `task #3 `)
-			assert.NotContains(t, rec.Body.String(), `task #4`)
+			assert.NotContains(t, rec.Body.String(), `task #4 `)
-			assert.NotContains(t, rec.Body.String(), `task #5`)
+			assert.NotContains(t, rec.Body.String(), `task #5 `)
-			assert.Contains(t, rec.Body.String(), `task #6`)
+			assert.Contains(t, rec.Body.String(), `task #6 `)
-			assert.NotContains(t, rec.Body.String(), `task #7`)
+			assert.NotContains(t, rec.Body.String(), `task #7 `)
-			assert.NotContains(t, rec.Body.String(), `task #8`)
+			assert.NotContains(t, rec.Body.String(), `task #8 `)
-			assert.NotContains(t, rec.Body.String(), `task #9`)
+			assert.NotContains(t, rec.Body.String(), `task #9 `)
 			assert.NotContains(t, rec.Body.String(), `task #10`)
 			assert.NotContains(t, rec.Body.String(), `task #11`)
 			assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -113,49 +113,49 @@ func TestTaskCollection(t *testing.T) {
 			t.Run("by priority", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"priority"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
+				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
 			})
 			t.Run("by priority desc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"priority"}, "order_by": []string{"desc"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-3","index":3,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":4,"title":"task #4 low prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":1`)
+				assert.Contains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-3","index":3,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":4,"title":"task #4 low prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":1`)
 			})
 			t.Run("by priority asc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"priority"}, "order_by": []string{"asc"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
+				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
 			})
 			// should equal duedate asc
 			t.Run("by due_date", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
+				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
 			})
 			t.Run("by duedate desc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}, "order_by": []string{"desc"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":6,"title":"task #6 lower due date`)
+				assert.Contains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":6,"title":"task #6 lower due date`)
 			})
 			// Due date without unix suffix
 			t.Run("by duedate asc without  suffix", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}, "order_by": []string{"asc"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
+				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
 			})
 			t.Run("by due_date without suffix", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
+				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
 			})
 			t.Run("by duedate desc without  suffix", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}, "order_by": []string{"desc"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":6,"title":"task #6 lower due date`)
+				assert.Contains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":6,"title":"task #6 lower due date`)
 			})
 			t.Run("by duedate asc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}, "order_by": []string{"asc"}}, urlParams)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
+				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
 			})
 			t.Run("invalid sort parameter", func(t *testing.T) {
 				_, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"loremipsum"}}, urlParams)
@@ -171,10 +171,10 @@ func TestTaskCollection(t *testing.T) {
 				// Invalid parameter should not sort at all
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort": []string{"loremipsum"}}, urlParams)
 				assert.NoError(t, err)
-				assert.NotContains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":1`)
+				assert.NotContains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":1`)
-				assert.NotContains(t, rec.Body.String(), `{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":1,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
+				assert.NotContains(t, rec.Body.String(), `{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":1,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
-				assert.NotContains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":6,"title":"task #6 lower due date"`)
+				assert.NotContains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":6,"title":"task #6 lower due date"`)
-				assert.NotContains(t, rec.Body.String(), `{"id":6,"title":"task #6 lower due date","description":"","done":false,"due_date":1543616724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
+				assert.NotContains(t, rec.Body.String(), `{"id":6,"title":"task #6 lower due date","description":"","done":false,"due_date":1543616724,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
 			})
 		})
 		t.Run("Filter", func(t *testing.T) {
@@ -190,14 +190,14 @@ func TestTaskCollection(t *testing.T) {
 					)
 					assert.NoError(t, err)
 					assert.NotContains(t, rec.Body.String(), `task #1`)
-					assert.NotContains(t, rec.Body.String(), `task #2`)
+					assert.NotContains(t, rec.Body.String(), `task #2 `)
-					assert.NotContains(t, rec.Body.String(), `task #3`)
+					assert.NotContains(t, rec.Body.String(), `task #3 `)
-					assert.NotContains(t, rec.Body.String(), `task #4`)
+					assert.NotContains(t, rec.Body.String(), `task #4 `)
-					assert.Contains(t, rec.Body.String(), `task #5`)
+					assert.Contains(t, rec.Body.String(), `task #5 `)
-					assert.Contains(t, rec.Body.String(), `task #6`)
+					assert.Contains(t, rec.Body.String(), `task #6 `)
-					assert.Contains(t, rec.Body.String(), `task #7`)
+					assert.Contains(t, rec.Body.String(), `task #7 `)
-					assert.Contains(t, rec.Body.String(), `task #8`)
+					assert.Contains(t, rec.Body.String(), `task #8 `)
-					assert.Contains(t, rec.Body.String(), `task #9`)
+					assert.Contains(t, rec.Body.String(), `task #9 `)
 					assert.NotContains(t, rec.Body.String(), `task #10`)
 					assert.NotContains(t, rec.Body.String(), `task #11`)
 					assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -215,14 +215,14 @@ func TestTaskCollection(t *testing.T) {
 					)
 					assert.NoError(t, err)
 					assert.NotContains(t, rec.Body.String(), `task #1`)
-					assert.NotContains(t, rec.Body.String(), `task #2`)
+					assert.NotContains(t, rec.Body.String(), `task #2 `)
-					assert.NotContains(t, rec.Body.String(), `task #3`)
+					assert.NotContains(t, rec.Body.String(), `task #3 `)
-					assert.NotContains(t, rec.Body.String(), `task #4`)
+					assert.NotContains(t, rec.Body.String(), `task #4 `)
-					assert.NotContains(t, rec.Body.String(), `task #5`)
+					assert.NotContains(t, rec.Body.String(), `task #5 `)
-					assert.NotContains(t, rec.Body.String(), `task #6`)
+					assert.NotContains(t, rec.Body.String(), `task #6 `)
-					assert.Contains(t, rec.Body.String(), `task #7`)
+					assert.Contains(t, rec.Body.String(), `task #7 `)
-					assert.NotContains(t, rec.Body.String(), `task #8`)
+					assert.NotContains(t, rec.Body.String(), `task #8 `)
-					assert.Contains(t, rec.Body.String(), `task #9`)
+					assert.Contains(t, rec.Body.String(), `task #9 `)
 					assert.NotContains(t, rec.Body.String(), `task #10`)
 					assert.NotContains(t, rec.Body.String(), `task #11`)
 					assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -255,14 +255,14 @@ func TestTaskCollection(t *testing.T) {
 					)
 					assert.NoError(t, err)
 					assert.NotContains(t, rec.Body.String(), `task #1`)
-					assert.NotContains(t, rec.Body.String(), `task #2`)
+					assert.NotContains(t, rec.Body.String(), `task #2 `)
-					assert.NotContains(t, rec.Body.String(), `task #3`)
+					assert.NotContains(t, rec.Body.String(), `task #3 `)
-					assert.NotContains(t, rec.Body.String(), `task #4`)
+					assert.NotContains(t, rec.Body.String(), `task #4 `)
-					assert.Contains(t, rec.Body.String(), `task #5`)
+					assert.Contains(t, rec.Body.String(), `task #5 `)
-					assert.Contains(t, rec.Body.String(), `task #6`)
+					assert.Contains(t, rec.Body.String(), `task #6 `)
-					assert.Contains(t, rec.Body.String(), `task #7`)
+					assert.Contains(t, rec.Body.String(), `task #7 `)
-					assert.NotContains(t, rec.Body.String(), `task #8`)
+					assert.NotContains(t, rec.Body.String(), `task #8 `)
-					assert.Contains(t, rec.Body.String(), `task #9`)
+					assert.Contains(t, rec.Body.String(), `task #9 `)
 					assert.NotContains(t, rec.Body.String(), `task #10`)
 					assert.NotContains(t, rec.Body.String(), `task #11`)
 					assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -291,14 +291,14 @@ func TestTaskCollection(t *testing.T) {
 				)
 				assert.NoError(t, err)
 				assert.NotContains(t, rec.Body.String(), `task #1`)
-				assert.NotContains(t, rec.Body.String(), `task #2`)
+				assert.NotContains(t, rec.Body.String(), `task #2 `)
-				assert.NotContains(t, rec.Body.String(), `task #3`)
+				assert.NotContains(t, rec.Body.String(), `task #3 `)
-				assert.NotContains(t, rec.Body.String(), `task #4`)
+				assert.NotContains(t, rec.Body.String(), `task #4 `)
-				assert.Contains(t, rec.Body.String(), `task #5`)
+				assert.Contains(t, rec.Body.String(), `task #5 `)
-				assert.Contains(t, rec.Body.String(), `task #6`)
+				assert.Contains(t, rec.Body.String(), `task #6 `)
-				assert.Contains(t, rec.Body.String(), `task #7`)
+				assert.Contains(t, rec.Body.String(), `task #7 `)
-				assert.Contains(t, rec.Body.String(), `task #8`)
+				assert.Contains(t, rec.Body.String(), `task #8 `)
-				assert.Contains(t, rec.Body.String(), `task #9`)
+				assert.Contains(t, rec.Body.String(), `task #9 `)
 				assert.NotContains(t, rec.Body.String(), `task #10`)
 				assert.NotContains(t, rec.Body.String(), `task #11`)
 				assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -314,14 +314,14 @@ func TestTaskCollection(t *testing.T) {
 			assert.NoError(t, err)
 			// Not using assert.Equal to avoid having the tests break every time we add new fixtures
 			assert.Contains(t, rec.Body.String(), `task #1`)
-			assert.Contains(t, rec.Body.String(), `task #2`)
+			assert.Contains(t, rec.Body.String(), `task #2 `)
-			assert.Contains(t, rec.Body.String(), `task #3`)
+			assert.Contains(t, rec.Body.String(), `task #3 `)
-			assert.Contains(t, rec.Body.String(), `task #4`)
+			assert.Contains(t, rec.Body.String(), `task #4 `)
-			assert.Contains(t, rec.Body.String(), `task #5`)
+			assert.Contains(t, rec.Body.String(), `task #5 `)
-			assert.Contains(t, rec.Body.String(), `task #6`)
+			assert.Contains(t, rec.Body.String(), `task #6 `)
-			assert.Contains(t, rec.Body.String(), `task #7`)
+			assert.Contains(t, rec.Body.String(), `task #7 `)
-			assert.Contains(t, rec.Body.String(), `task #8`)
+			assert.Contains(t, rec.Body.String(), `task #8 `)
-			assert.Contains(t, rec.Body.String(), `task #9`)
+			assert.Contains(t, rec.Body.String(), `task #9 `)
 			assert.Contains(t, rec.Body.String(), `task #10`)
 			assert.Contains(t, rec.Body.String(), `task #11`)
 			assert.Contains(t, rec.Body.String(), `task #12`)
@@ -347,14 +347,14 @@ func TestTaskCollection(t *testing.T) {
 			rec, err := testHandler.testReadAllWithUser(url.Values{"s": []string{"task #6"}}, nil)
 			assert.NoError(t, err)
 			assert.NotContains(t, rec.Body.String(), `task #1`)
-			assert.NotContains(t, rec.Body.String(), `task #2`)
+			assert.NotContains(t, rec.Body.String(), `task #2 `)
-			assert.NotContains(t, rec.Body.String(), `task #3`)
+			assert.NotContains(t, rec.Body.String(), `task #3 `)
-			assert.NotContains(t, rec.Body.String(), `task #4`)
+			assert.NotContains(t, rec.Body.String(), `task #4 `)
-			assert.NotContains(t, rec.Body.String(), `task #5`)
+			assert.NotContains(t, rec.Body.String(), `task #5 `)
-			assert.Contains(t, rec.Body.String(), `task #6`)
+			assert.Contains(t, rec.Body.String(), `task #6 `)
-			assert.NotContains(t, rec.Body.String(), `task #7`)
+			assert.NotContains(t, rec.Body.String(), `task #7 `)
-			assert.NotContains(t, rec.Body.String(), `task #8`)
+			assert.NotContains(t, rec.Body.String(), `task #8 `)
-			assert.NotContains(t, rec.Body.String(), `task #9`)
+			assert.NotContains(t, rec.Body.String(), `task #9 `)
 			assert.NotContains(t, rec.Body.String(), `task #10`)
 			assert.NotContains(t, rec.Body.String(), `task #11`)
 			assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -366,42 +366,42 @@ func TestTaskCollection(t *testing.T) {
 			t.Run("by priority", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"priority"}}, nil)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
+				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
 			})
 			t.Run("by priority desc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"priority"}, "order_by": []string{"desc"}}, nil)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-3","index":3,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":4,"title":"task #4 low prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":1`)
+				assert.Contains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-3","index":3,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":4,"title":"task #4 low prio","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":1`)
 			})
 			t.Run("by priority asc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"priority"}, "order_by": []string{"asc"}}, nil)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
+				assert.Contains(t, rec.Body.String(), `{"id":33,"title":"task #33 with percent done","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"0001-01-01T00:00:00Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0.5,"identifier":"test1-17","index":17,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":1,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}]`)
 			})
 			// should equal duedate asc
 			t.Run("by due_date", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}}, nil)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
+				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
 			})
 			t.Run("by duedate desc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}, "order_by": []string{"desc"}}, nil)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":6,"title":"task #6 lower due date`)
+				assert.Contains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":6,"title":"task #6 lower due date`)
 			})
 			t.Run("by duedate asc", func(t *testing.T) {
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort_by": []string{"due_date"}, "order_by": []string{"asc"}}, nil)
 				assert.NoError(t, err)
-				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
+				assert.Contains(t, rec.Body.String(), `[{"id":6,"title":"task #6 lower due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-11-30T22:25:24Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-6","index":6,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":3,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"done_at":"0001-01-01T00:00:00Z","due_date":"2018-12-01T03:58:44Z","reminder_dates":null,"reminders":null,"project_id":1,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":"0001-01-01T00:00:00Z","end_date":"0001-01-01T00:00:00Z","assignees":null,"labels":null,"hex_color":"","percent_done":0,"identifier":"test1-5","index":5,"related_tasks":{},"attachments":null,"cover_image_attachment_id":0,"is_favorite":false,"created":"2018-12-01T01:12:04Z","updated":"2018-12-01T01:12:04Z","bucket_id":2,"position":0,"kanban_position":0,"created_by":{"id":1,"name":"","username":"user1","created":"2018-12-01T15:13:12Z","updated":"2018-12-02T15:13:12Z"}}`)
 			})
 			t.Run("invalid parameter", func(t *testing.T) {
 				// Invalid parameter should not sort at all
 				rec, err := testHandler.testReadAllWithUser(url.Values{"sort": []string{"loremipsum"}}, nil)
 				assert.NoError(t, err)
-				assert.NotContains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":1`)
+				assert.NotContains(t, rec.Body.String(), `[{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":1`)
-				assert.NotContains(t, rec.Body.String(), `{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":1,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
+				assert.NotContains(t, rec.Body.String(), `{"id":4,"title":"task #4 low prio","description":"","done":false,"due_date":0,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":1,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":3,"title":"task #3 high prio","description":"","done":false,"due_date":0,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":100,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
-				assert.NotContains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":6,"title":"task #6 lower due date"`)
+				assert.NotContains(t, rec.Body.String(), `[{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":6,"title":"task #6 lower due date"`)
-				assert.NotContains(t, rec.Body.String(), `{"id":6,"title":"task #6 lower due date","description":"","done":false,"due_date":1543616724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
+				assert.NotContains(t, rec.Body.String(), `{"id":6,"title":"task #6 lower due date","description":"","done":false,"due_date":1543616724,"reminder_dates":null,"reminders":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"hex_color":"","created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}},{"id":5,"title":"task #5 higher due date","description":"","done":false,"due_date":1543636724,"reminder_dates":null,"repeat_after":0,"repeat_mode":0,"priority":0,"start_date":0,"end_date":0,"assignees":null,"labels":null,"created":1543626724,"updated":1543626724,"created_by":{"id":0,"name":"","username":"","email":"","created":0,"updated":0}}]`)
 			})
 		})
 		t.Run("Filter", func(t *testing.T) {
@@ -417,14 +417,14 @@ func TestTaskCollection(t *testing.T) {
 					)
 					assert.NoError(t, err)
 					assert.NotContains(t, rec.Body.String(), `task #1`)
-					assert.NotContains(t, rec.Body.String(), `task #2`)
+					assert.NotContains(t, rec.Body.String(), `task #2 `)
-					assert.NotContains(t, rec.Body.String(), `task #3`)
+					assert.NotContains(t, rec.Body.String(), `task #3 `)
-					assert.NotContains(t, rec.Body.String(), `task #4`)
+					assert.NotContains(t, rec.Body.String(), `task #4 `)
-					assert.Contains(t, rec.Body.String(), `task #5`)
+					assert.Contains(t, rec.Body.String(), `task #5 `)
-					assert.Contains(t, rec.Body.String(), `task #6`)
+					assert.Contains(t, rec.Body.String(), `task #6 `)
-					assert.Contains(t, rec.Body.String(), `task #7`)
+					assert.Contains(t, rec.Body.String(), `task #7 `)
-					assert.Contains(t, rec.Body.String(), `task #8`)
+					assert.Contains(t, rec.Body.String(), `task #8 `)
-					assert.Contains(t, rec.Body.String(), `task #9`)
+					assert.Contains(t, rec.Body.String(), `task #9 `)
 					assert.NotContains(t, rec.Body.String(), `task #10`)
 					assert.NotContains(t, rec.Body.String(), `task #11`)
 					assert.NotContains(t, rec.Body.String(), `task #12`)
@@ -442,14 +442,14 @@ func TestTaskCollection(t *testing.T) {
 					)
 					assert.NoError(t, err)
 					assert.NotContains(t, rec.Body.String(), `task #1`)
-					assert.NotContains(t, rec.Body.String(), `task #2`)
+					assert.NotContains(t, rec.Body.String(), `task #2 `)
-					assert.NotContains(t, rec.Body.String(), `task #3`)
+					assert.NotContains(t, rec.Body.String(), `task #3 `)
-					assert.NotContains(t, rec.Body.String(), `task #4`)
+					assert.NotContains(t, rec.Body.String(), `task #4 `)
-					assert.NotContains(t, rec.Body.String(), `task #5`)
+					assert.NotContains(t, rec.Body.String(), `task #5 `)
-					assert.NotContains(t, rec.Body.String(), `task #6`)
+					assert.NotContains(t, rec.Body.String(), `task #6 `)
-					assert.Contains(t, rec.Body.String(), `task #7`)
+					assert.Contains(t, rec.Body.String(), `task #7 `)
-					assert.NotContains(t, rec.Body.String(), `task #8`)
+					assert.NotContains(t, rec.Body.String(), `task #8 `)
-					assert.Contains(t, rec.Body.String(), `task #9`)
+					assert.Contains(t, rec.Body.String(), `task #9 `)
 					assert.NotContains(t, rec.Body.String(), `task #10`)
 					assert.NotContains(t, rec.Body.String(), `task #11`)
 					assert.NotContains(t, rec.Body.String(), `task #12`)

pkg/integrations/task_test.go

@@ -95,24 +95,47 @@ func TestTask(t *testing.T) {
 				assert.Contains(t, rec.Body.String(), `"due_date":"0001-01-01T00:00:00Z"`)
 				assert.NotContains(t, rec.Body.String(), `"due_date":"2020-02-10T10:00:00Z"`)
 			})
-			t.Run("Reminders", func(t *testing.T) {
+			// Deprecated: Remove if ReminderDates is removed
+			t.Run("ReminderDates", func(t *testing.T) {
 				rec, err := testHandler.testUpdateWithUser(nil, map[string]string{"projecttask": "1"}, `{"reminder_dates": ["2020-02-10T10:00:00Z","2020-02-11T10:00:00Z"]}`)
 				assert.NoError(t, err)
 				assert.Contains(t, rec.Body.String(), `"reminder_dates":["2020-02-10T10:00:00Z","2020-02-11T10:00:00Z"]`)
 				assert.NotContains(t, rec.Body.String(), `"reminder_dates": null`)
 			})
-			t.Run("Reminders unset to empty array", func(t *testing.T) {
+			// Deprecated: Remove if ReminderDates is removed
+			t.Run("ReminderDates unset to empty array", func(t *testing.T) {
 				rec, err := testHandler.testUpdateWithUser(nil, map[string]string{"projecttask": "27"}, `{"reminder_dates": []}`)
 				assert.NoError(t, err)
 				assert.Contains(t, rec.Body.String(), `"reminder_dates":null`)
 				assert.NotContains(t, rec.Body.String(), `"reminder_dates":[1543626724,1543626824]`)
 			})
-			t.Run("Reminders unset to null", func(t *testing.T) {
+			// Deprecated: Remove if ReminderDates is removed
+			t.Run("ReminderDates unset to null", func(t *testing.T) {
 				rec, err := testHandler.testUpdateWithUser(nil, map[string]string{"projecttask": "27"}, `{"reminder_dates": null}`)
 				assert.NoError(t, err)
 				assert.Contains(t, rec.Body.String(), `"reminder_dates":null`)
 				assert.NotContains(t, rec.Body.String(), `"reminder_dates":[1543626724,1543626824]`)
 			})
+			t.Run("Reminders", func(t *testing.T) {
+				rec, err := testHandler.testUpdateWithUser(nil, map[string]string{"projecttask": "1"}, `{"reminders": [{"reminder": "2020-02-10T10:00:00Z"},{"reminder": "2020-02-11T10:00:00Z"}]}`)
+				assert.NoError(t, err)
+				assert.Contains(t, rec.Body.String(), `"reminders":[`)
+				assert.Contains(t, rec.Body.String(), `{"reminder":"2020-02-10T10:00:00Z"`)
+				assert.Contains(t, rec.Body.String(), `{"reminder":"2020-02-11T10:00:00Z"`)
+				assert.NotContains(t, rec.Body.String(), `"reminders":null`)
+			})
+			t.Run("Reminders unset to empty array", func(t *testing.T) {
+				rec, err := testHandler.testUpdateWithUser(nil, map[string]string{"projecttask": "27"}, `{"reminders": []}`)
+				assert.NoError(t, err)
+				assert.Contains(t, rec.Body.String(), `"reminders":null`)
+				assert.NotContains(t, rec.Body.String(), `{"Reminder":"2020-02-10T10:00:00Z"`)
+			})
+			t.Run("Reminders unset to null", func(t *testing.T) {
+				rec, err := testHandler.testUpdateWithUser(nil, map[string]string{"projecttask": "27"}, `{"reminders": null}`)
+				assert.NoError(t, err)
+				assert.Contains(t, rec.Body.String(), `"reminder_dates":null`)
+				assert.NotContains(t, rec.Body.String(), `{"Reminder":"2020-02-10T10:00:00Z"`)
+			})
 			t.Run("Repeat after", func(t *testing.T) {
 				rec, err := testHandler.testUpdateWithUser(nil, map[string]string{"projecttask": "1"}, `{"repeat_after":3600}`)
 				assert.NoError(t, err)

pkg/migration/20230307171848.go

@@ -0,0 +1,44 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package migration
+
+import (
+	"src.techknowlogick.com/xormigrate"
+	"xorm.io/xorm"
+)
+
+type taskReminders20230307171848 struct {
+	RelativePeriod int64  `xorm:"bigint null" json:"relative_period"`
+	RelativeTo     string `xorm:"varchar(50) null" json:"relative_to,omitempty"`
+}
+
+func (taskReminders20230307171848) TableName() string {
+	return "task_reminders"
+}
+
+func init() {
+	migrations = append(migrations, &xormigrate.Migration{
+		ID:          "20230307171848",
+		Description: "Add relative period to task reminders",
+		Migrate: func(tx *xorm.Engine) error {
+			return tx.Sync2(taskReminders20230307171848{})
+		},
+		Rollback: func(tx *xorm.Engine) error {
+			return nil
+		},
+	})
+}

pkg/models/error.go

@@ -875,6 +875,33 @@ func (err ErrUserAlreadyAssigned) HTTPError() web.HTTPError {
 	}
 }
 
+// ErrReminderRelativeToMissing represents an error where a task has a relative reminder without reference date
+type ErrReminderRelativeToMissing struct {
+	TaskID int64
+}
+
+// IsErrReminderRelativeToMissing checks if an error is ErrReminderRelativeToMissing.
+func IsErrReminderRelativeToMissing(err error) bool {
+	_, ok := err.(ErrReminderRelativeToMissing)
+	return ok
+}
+
+func (err ErrReminderRelativeToMissing) Error() string {
+	return fmt.Sprintf("Task [TaskID: %v] has a relative reminder without relative_to", err.TaskID)
+}
+
+// ErrCodeRelationDoesNotExist holds the unique world-error code of this error
+const ErrCodeReminderRelativeToMissing = 4022
+
+// HTTPError holds the http error description
+func (err ErrReminderRelativeToMissing) HTTPError() web.HTTPError {
+	return web.HTTPError{
+		HTTPCode: http.StatusBadRequest,
+		Code:     ErrCodeReminderRelativeToMissing,
+		Message:  "Please provide what the reminder date is relative to",
+	}
+}
+
 // =================
 // Namespace errors
 // =================

pkg/models/task_collection_filter.go

@@ -266,6 +266,13 @@ func getNativeValueForTaskField(fieldName string, comparator taskFilterComparato
 		return nil, nil, ErrInvalidTaskField{TaskField: fieldName}
 	}
 
+	if realFieldName == "Reminders" {
+		field, ok = reflect.TypeOf(&TaskReminder{}).Elem().FieldByName("Reminder")
+		if !ok {
+			return nil, nil, ErrInvalidTaskField{TaskField: fieldName}
+		}
+	}
+
 	if comparator == taskFilterComparatorIn {
 		vals := strings.Split(value, ",")
 		valueSlice := []interface{}{}

pkg/models/task_collection_test.go

@@ -169,9 +169,17 @@ func TestTaskCollection_ReadAll(t *testing.T) {
 			label4,
 		},
 		RelatedTasks: map[RelationKind][]*Task{},
-		Reminders: []time.Time{
+		ReminderDates: []time.Time{
 			time.Unix(1543626824, 0).In(loc),
 		},
+		Reminders: []*TaskReminder{
+			{
+				ID:       3,
+				TaskID:   2,
+				Reminder: time.Unix(1543626824, 0).In(loc),
+				Created:  time.Unix(1543626724, 0).In(loc),
+			},
+		},
 		Created: time.Unix(1543626724, 0).In(loc),
 		Updated: time.Unix(1543626724, 0).In(loc),
 	}
@@ -472,15 +480,32 @@ func TestTaskCollection_ReadAll(t *testing.T) {
 	}
 	task27 := &Task{
 		ID:          27,
-		Title:       "task #27 with reminders",
+		Title:       "task #27 with reminders and start_date",
 		Identifier:  "test1-12",
 		Index:       12,
 		CreatedByID: 1,
 		CreatedBy:   user1,
-		Reminders: []time.Time{
+		ReminderDates: []time.Time{
 			time.Unix(1543626724, 0).In(loc),
 			time.Unix(1543626824, 0).In(loc),
 		},
+		Reminders: []*TaskReminder{
+			{
+				ID:       1,
+				TaskID:   27,
+				Reminder: time.Unix(1543626724, 0).In(loc),
+				Created:  time.Unix(1543626724, 0).In(loc),
+			},
+			{
+				ID:             2,
+				TaskID:         27,
+				Reminder:       time.Unix(1543626824, 0).In(loc),
+				Created:        time.Unix(1543626724, 0).In(loc),
+				RelativePeriod: -3600,
+				RelativeTo:     "start_date",
+			},
+		},
+		StartDate:    time.Unix(1543616724, 0).In(loc),
 		ProjectID:    1,
 		BucketID:     1,
 		RelatedTasks: map[RelationKind][]*Task{},
@@ -906,7 +931,7 @@ func TestTaskCollection_ReadAll(t *testing.T) {
 			wantErr: false,
 		},
 		{
-			name: "filtered reminders",
+			name: "filtered reminder dates",
 			fields: fields{
 				FilterBy:         []string{"reminders", "reminders"},
 				FilterValue:      []string{"2018-10-01T00:00:00+00:00", "2018-12-10T00:00:00+00:00"},
@@ -1246,7 +1271,7 @@ func TestTaskCollection_ReadAll(t *testing.T) {
 					return
 				}
 
-				t.Errorf("Test %s, Task.ReadAll() = %v, want %v, \ndiff: %v", tt.name, got, tt.want, diff)
+				t.Errorf("Test %s, Task.ReadAll() = %v, \nwant %v, \ndiff: %v", tt.name, got, tt.want, diff)
 			}
 		})
 	}

pkg/models/task_reminder.go

@@ -33,12 +33,29 @@ import (
 	"code.vikunja.io/api/pkg/user"
 )
 
-// TaskReminder holds a reminder on a task
+// ReminderRelation represents the date attribute of the task which a period based reminder relates to
+type ReminderRelation string
+
+// All valid ReminderRelations
+const (
+	ReminderRelationDueDate   ReminderRelation = `due_date`
+	ReminderRelationStartDate ReminderRelation = `start_date`
+	ReminderRelationEndDate   ReminderRelation = `end_date`
+)
+
+// TaskReminder holds a reminder on a task.
+// If RelativeTo and the assciated date field are defined, then the attribute Reminder will be computed.
+// If RelativeTo is missing, than Reminder must be given.
 type TaskReminder struct {
-	ID       int64     `xorm:"bigint autoincr not null unique pk"`
+	ID     int64 `xorm:"bigint autoincr not null unique pk" json:"-"`
-	TaskID   int64     `xorm:"bigint not null INDEX"`
+	TaskID int64 `xorm:"bigint not null INDEX" json:"-"`
-	Reminder time.Time `xorm:"DATETIME not null INDEX 'reminder'"`
+	// The absolute time when the user wants to be reminded of the task.
-	Created  time.Time `xorm:"created not null"`
+	Reminder time.Time `xorm:"DATETIME not null INDEX 'reminder'" json:"reminder"`
+	Created  time.Time `xorm:"created not null" json:"-"`
+	// A period in seconds relative to another date argument. Negative values mean the reminder triggers before the date. Default: 0, tiggers when RelativeTo is due.
+	RelativePeriod int64 `xorm:"bigint null" json:"relative_period"`
+	// The name of the date field to which the relative period refers to.
+	RelativeTo ReminderRelation `xorm:"varchar(50) null" json:"relative_to"`
 }
 
 // TableName returns a pretty table name

pkg/models/tasks.go

@@ -62,7 +62,11 @@ type Task struct {
 	// The time when the task is due.
 	DueDate time.Time `xorm:"DATETIME INDEX null 'due_date'" json:"due_date"`
 	// An array of datetimes when the user wants to be reminded of the task.
-	Reminders []time.Time `xorm:"-" json:"reminder_dates"`
+	//
+	// Deprecated: Use Reminders
+	ReminderDates []time.Time `xorm:"-" json:"reminder_dates"`
+	// An array of reminders that are associated with this task.
+	Reminders []*TaskReminder `xorm:"-" json:"reminders"`
 	// The project this task belongs to.
 	ProjectID int64 `xorm:"bigint INDEX not null" json:"project_id" param:"project"`
 	// An amount in seconds this task repeats itself. If this is set, when marking the task as done, it will mark itself as "undone" and then increase all remindes and the due date by its amount.
@@ -641,8 +645,8 @@ func addAttachmentsToTasks(s *xorm.Session, taskIDs []int64, taskMap map[int64]*
 	return
 }
 
-func getTaskReminderMap(s *xorm.Session, taskIDs []int64) (taskReminders map[int64][]time.Time, err error) {
+func getTaskReminderMap(s *xorm.Session, taskIDs []int64) (taskReminders map[int64][]*TaskReminder, err error) {
-	taskReminders = make(map[int64][]time.Time)
+	taskReminders = make(map[int64][]*TaskReminder)
 
 	// Get all reminders and put them in a map to have it easier later
 	reminders, err := getRemindersForTasks(s, taskIDs)
@@ -651,7 +655,7 @@ func getTaskReminderMap(s *xorm.Session, taskIDs []int64) (taskReminders map[int
 	}
 
 	for _, r := range reminders {
-		taskReminders[r.TaskID] = append(taskReminders[r.TaskID], r.Reminder)
+		taskReminders[r.TaskID] = append(taskReminders[r.TaskID], r)
 	}
 
 	return
@@ -772,6 +776,11 @@ func addMoreInfoToTasks(s *xorm.Session, taskMap map[int64]*Task, a web.Auth) (e
 		// Make created by user objects
 		task.CreatedBy = users[task.CreatedByID]
 
+		// Add the reminder dates (Remove, when ReminderDates is removed)
+		for _, r := range taskReminders[task.ID] {
+			task.ReminderDates = append(task.ReminderDates, r.Reminder)
+		}
+
 		// Add the reminders
 		task.Reminders = taskReminders[task.ID]
 
@@ -965,7 +974,7 @@ func createTask(s *xorm.Session, t *Task, a web.Auth, updateAssignees bool) (err
 	}
 
 	// Update the reminders
-	if err := t.updateReminders(s, t.Reminders); err != nil {
+	if err := t.updateReminders(s, t); err != nil {
 		return err
 	}
 
@@ -1017,15 +1026,19 @@ func (t *Task) Update(s *xorm.Session, a web.Auth) (err error) {
 		t.ProjectID = ot.ProjectID
 	}
 
-	// Get the reminders
+	// Get the stored reminders
 	reminders, err := getRemindersForTasks(s, []int64{t.ID})
 	if err != nil {
 		return
 	}
 
-	ot.Reminders = make([]time.Time, len(reminders))
+	// Old task has the stored reminders
+	ot.Reminders = reminders
+
+	// Deprecated: remove when ReminderDates is removed
+	ot.ReminderDates = make([]time.Time, len(reminders))
 	for i, r := range reminders {
-		ot.Reminders[i] = r.Reminder
+		ot.ReminderDates[i] = r.Reminder
 	}
 
 	targetBucket, err := setTaskBucket(s, t, &ot, t.BucketID != 0 && t.BucketID != ot.BucketID)
@@ -1049,7 +1062,7 @@ func (t *Task) Update(s *xorm.Session, a web.Auth) (err error) {
 	}
 
 	// Update the reminders
-	if err := ot.updateReminders(s, t.Reminders); err != nil {
+	if err := ot.updateReminders(s, t); err != nil {
 		return err
 	}
 
@@ -1331,9 +1344,9 @@ func setTaskDatesDefault(oldTask, newTask *Task) {
 	// To make this easier, we sort them first because we can then rely on the fact the first is the smallest
 	if len(oldTask.Reminders) > 0 {
 		for in, r := range oldTask.Reminders {
-			newTask.Reminders[in] = r.Add(repeatDuration)
+			newTask.Reminders[in].Reminder = r.Reminder.Add(repeatDuration)
-			for !newTask.Reminders[in].After(now) {
+			for !newTask.Reminders[in].Reminder.After(now) {
-				newTask.Reminders[in] = newTask.Reminders[in].Add(repeatDuration)
+				newTask.Reminders[in].Reminder = newTask.Reminders[in].Reminder.Add(repeatDuration)
 			}
 		}
 	}
@@ -1364,7 +1377,7 @@ func setTaskDatesMonthRepeat(oldTask, newTask *Task) {
 	newTask.Reminders = oldTask.Reminders
 	if len(oldTask.Reminders) > 0 {
 		for in, r := range oldTask.Reminders {
-			newTask.Reminders[in] = addOneMonthToDate(r)
+			newTask.Reminders[in].Reminder = addOneMonthToDate(r.Reminder)
 		}
 	}
 
@@ -1405,12 +1418,12 @@ func setTaskDatesFromCurrentDateRepeat(oldTask, newTask *Task) {
 	// To make this easier, we sort them first because we can then rely on the fact the first is the smallest
 	if len(oldTask.Reminders) > 0 {
 		sort.Slice(oldTask.Reminders, func(i, j int) bool {
-			return oldTask.Reminders[i].Unix() < oldTask.Reminders[j].Unix()
+			return oldTask.Reminders[i].Reminder.Unix() < oldTask.Reminders[j].Reminder.Unix()
 		})
-		first := oldTask.Reminders[0]
+		first := oldTask.Reminders[0].Reminder
 		for in, r := range oldTask.Reminders {
-			diff := r.Sub(first)
+			diff := r.Reminder.Sub(first)
-			newTask.Reminders[in] = now.Add(repeatDuration + diff)
+			newTask.Reminders[in].Reminder = now.Add(repeatDuration + diff)
 		}
 	}
 
@@ -1478,11 +1491,66 @@ func updateDone(oldTask *Task, newTask *Task) {
 	}
 }
 
+// Deprecated: will be removed when ReminderDates are removed from Task.
+// For now the method just creates TaskReminder objects from the ReminderDates and overwrites Reminder.
+func (t *Task) overwriteRemindersWithReminderDates(reminderDates []time.Time) {
+	// If the client still sends old reminder_dates, then these will overwrite
+	// the Reminders, if the were sent by the client, too.
+	// We assume that clients still using the old API with reminder_dates do not understand the new reminders.
+	// Clients who want to use the new Reminder structure must explicitey unset reminder_dates.
+
+	// start with empty Reminders
+	reminders := make([]*TaskReminder, 0)
+
+	// append absolute triggers from ReminderDates
+	for _, reminderDate := range reminderDates {
+		reminders = append(reminders, &TaskReminder{TaskID: t.ID, Reminder: reminderDate})
+	}
+	t.Reminders = reminders
+}
+
+// Set the absolute trigger dates for Reminders with relative period
+func updateRelativeReminderDates(task *Task) (err error) {
+	for _, reminder := range task.Reminders {
+		relativeDuration := time.Duration(reminder.RelativePeriod) * time.Second
+		if reminder.RelativeTo != "" {
+			reminder.Reminder = time.Time{}
+		}
+		switch reminder.RelativeTo {
+		case ReminderRelationDueDate:
+			if !task.DueDate.IsZero() {
+				reminder.Reminder = task.DueDate.Add(relativeDuration)
+			}
+		case ReminderRelationStartDate:
+			if !task.StartDate.IsZero() {
+				reminder.Reminder = task.StartDate.Add(relativeDuration)
+			}
+		case ReminderRelationEndDate:
+			if !task.EndDate.IsZero() {
+				reminder.Reminder = task.EndDate.Add(relativeDuration)
+			}
+		default:
+			if reminder.RelativePeriod != 0 {
+				err = ErrReminderRelativeToMissing{
+					TaskID: task.ID,
+				}
+				return err
+			}
+		}
+	}
+	return nil
+}
+
 // Removes all old reminders and adds the new ones. This is a lot easier and less buggy than
 // trying to figure out which reminders changed and then only re-add those needed. And since it does
 // not make a performance difference we'll just do that.
-// The parameter is a slice with unix dates which holds the new reminders.
+// The parameter is a slice which holds the new reminders.
-func (t *Task) updateReminders(s *xorm.Session, reminders []time.Time) (err error) {
+func (t *Task) updateReminders(s *xorm.Session, task *Task) (err error) {
+
+	// Deprecated: This statement must be removed when ReminderDates will be removed
+	if task.ReminderDates != nil {
+		task.overwriteRemindersWithReminderDates(task.ReminderDates)
+	}
 
 	_, err = s.
 		Where("task_id = ?", t.ID).
@@ -1491,23 +1559,43 @@ func (t *Task) updateReminders(s *xorm.Session, reminders []time.Time) (err erro
 		return
 	}
 
-	// Resolve duplicates and sort them
+	err = updateRelativeReminderDates(task)
-	reminderMap := make(map[int64]time.Time, len(reminders))
+	if err != nil {
-	for _, reminder := range reminders {
+		return
-		reminderMap[reminder.UTC().Unix()] = reminder
 	}
 
+	// Resolve duplicates and sort them
+	reminderMap := make(map[int64]*TaskReminder, len(task.Reminders))
+	for _, reminder := range task.Reminders {
+		reminderMap[reminder.Reminder.UTC().Unix()] = reminder
+	}
+
+	t.Reminders = make([]*TaskReminder, 0, len(reminderMap))
+	t.ReminderDates = make([]time.Time, 0, len(reminderMap))
+
 	// Loop through all reminders and add them
 	for _, r := range reminderMap {
-		_, err = s.Insert(&TaskReminder{TaskID: t.ID, Reminder: r})
+		taskReminder := &TaskReminder{
+			TaskID:         t.ID,
+			Reminder:       r.Reminder,
+			RelativePeriod: r.RelativePeriod,
+			RelativeTo:     r.RelativeTo}
+		_, err = s.Insert(taskReminder)
 		if err != nil {
 			return err
 		}
+		t.Reminders = append(t.Reminders, taskReminder)
+		t.ReminderDates = append(t.ReminderDates, taskReminder.Reminder)
 	}
 
-	t.Reminders = reminders
+	// sort reminders
-	if len(reminders) == 0 {
+	sort.Slice(t.Reminders, func(i, j int) bool {
+		return t.Reminders[i].Reminder.Before(t.Reminders[j].Reminder)
+	})
+
+	if len(t.Reminders) == 0 {
 		t.Reminders = nil
+		t.ReminderDates = nil
 	}
 
 	err = updateProjectLastUpdated(s, &Project{ID: t.ProjectID})

pkg/models/tasks_test.go

@@ -70,6 +70,48 @@ func TestTask_Create(t *testing.T) {
 
 		events.AssertDispatched(t, &TaskCreatedEvent{})
 	})
+	t.Run("with reminders", func(t *testing.T) {
+		db.LoadAndAssertFixtures(t)
+		s := db.NewSession()
+		defer s.Close()
+
+		task := &Task{
+			Title:       "Lorem",
+			Description: "Lorem Ipsum Dolor",
+			ProjectID:   1,
+			DueDate:     time.Date(2023, time.March, 7, 22, 5, 0, 0, time.Local),
+			StartDate:   time.Date(2023, time.March, 7, 22, 5, 10, 0, time.Local),
+			EndDate:     time.Date(2023, time.March, 7, 22, 5, 20, 0, time.Local),
+			Reminders: []*TaskReminder{
+				{
+					RelativeTo:     "due_date",
+					RelativePeriod: 1,
+				},
+				{
+					RelativeTo:     "start_date",
+					RelativePeriod: -2,
+				},
+				{
+					RelativeTo:     "end_date",
+					RelativePeriod: -1,
+				},
+				{
+					Reminder: time.Date(2023, time.March, 7, 23, 0, 0, 0, time.Local),
+				},
+			}}
+		err := task.Create(s, usr)
+		assert.NoError(t, err)
+		assert.Equal(t, time.Date(2023, time.March, 7, 22, 5, 1, 0, time.Local), task.Reminders[0].Reminder)
+		assert.Equal(t, int64(1), task.Reminders[0].RelativePeriod)
+		assert.Equal(t, ReminderRelationDueDate, task.Reminders[0].RelativeTo)
+		assert.Equal(t, time.Date(2023, time.March, 7, 22, 5, 8, 0, time.Local), task.Reminders[1].Reminder)
+		assert.Equal(t, ReminderRelationStartDate, task.Reminders[1].RelativeTo)
+		assert.Equal(t, time.Date(2023, time.March, 7, 22, 5, 19, 0, time.Local), task.Reminders[2].Reminder)
+		assert.Equal(t, ReminderRelationEndDate, task.Reminders[2].RelativeTo)
+		assert.Equal(t, time.Date(2023, time.March, 7, 23, 0, 0, 0, time.Local), task.Reminders[3].Reminder)
+		err = s.Commit()
+		assert.NoError(t, err)
+	})
 	t.Run("empty title", func(t *testing.T) {
 		db.LoadAndAssertFixtures(t)
 		s := db.NewSession()
@@ -98,7 +140,7 @@ func TestTask_Create(t *testing.T) {
 		assert.Error(t, err)
 		assert.True(t, IsErrProjectDoesNotExist(err))
 	})
-	t.Run("noneixtant user", func(t *testing.T) {
+	t.Run("nonexistant user", func(t *testing.T) {
 		db.LoadAndAssertFixtures(t)
 		s := db.NewSession()
 		defer s.Close()
@@ -368,7 +410,51 @@ func TestTask_Update(t *testing.T) {
 		assert.NoError(t, err)
 		assert.Equal(t, int64(3), task.Index)
 	})
-	t.Run("the same date multiple times should be saved once", func(t *testing.T) {
+
+	t.Run("reminders will be updated", func(t *testing.T) {
+		db.LoadAndAssertFixtures(t)
+		s := db.NewSession()
+		defer s.Close()
+
+		task := &Task{
+			ID:        1,
+			ProjectID: 1,
+			Title:     "test",
+			DueDate:   time.Date(2023, time.March, 7, 22, 5, 0, 0, time.Local),
+			StartDate: time.Date(2023, time.March, 7, 22, 5, 10, 0, time.Local),
+			EndDate:   time.Date(2023, time.March, 7, 22, 5, 20, 0, time.Local),
+			Reminders: []*TaskReminder{
+				{
+					RelativeTo:     "due_date",
+					RelativePeriod: 1,
+				},
+				{
+					RelativeTo:     "start_date",
+					RelativePeriod: -2,
+				},
+				{
+					RelativeTo:     "end_date",
+					RelativePeriod: -1,
+				},
+				{
+					Reminder: time.Date(2023, time.March, 7, 23, 0, 0, 0, time.Local),
+				},
+			}}
+		err := task.Update(s, u)
+		assert.NoError(t, err)
+		assert.Equal(t, time.Date(2023, time.March, 7, 22, 5, 1, 0, time.Local), task.Reminders[0].Reminder)
+		assert.Equal(t, int64(1), task.Reminders[0].RelativePeriod)
+		assert.Equal(t, ReminderRelationDueDate, task.Reminders[0].RelativeTo)
+		assert.Equal(t, time.Date(2023, time.March, 7, 22, 5, 8, 0, time.Local), task.Reminders[1].Reminder)
+		assert.Equal(t, ReminderRelationStartDate, task.Reminders[1].RelativeTo)
+		assert.Equal(t, time.Date(2023, time.March, 7, 22, 5, 19, 0, time.Local), task.Reminders[2].Reminder)
+		assert.Equal(t, ReminderRelationEndDate, task.Reminders[2].RelativeTo)
+		assert.Equal(t, time.Date(2023, time.March, 7, 23, 0, 0, 0, time.Local), task.Reminders[3].Reminder)
+		err = s.Commit()
+		assert.NoError(t, err)
+		db.AssertCount(t, "task_reminders", builder.Eq{"task_id": 1}, 4)
+	})
+	t.Run("the same reminder multiple times should be saved once", func(t *testing.T) {
 		db.LoadAndAssertFixtures(t)
 		s := db.NewSession()
 		defer s.Close()
@@ -376,9 +462,13 @@ func TestTask_Update(t *testing.T) {
 		task := &Task{
 			ID:    1,
 			Title: "test",
-			Reminders: []time.Time{
+			Reminders: []*TaskReminder{
-				time.Unix(1674745156, 0),
+				{
-				time.Unix(1674745156, 223),
+					Reminder: time.Unix(1674745156, 0),
+				},
+				{
+					Reminder: time.Unix(1674745156, 223),
+				},
 			},
 			ProjectID: 1,
 		}
@@ -386,9 +476,42 @@ func TestTask_Update(t *testing.T) {
 		assert.NoError(t, err)
 		err = s.Commit()
 		assert.NoError(t, err)
-
 		db.AssertCount(t, "task_reminders", builder.Eq{"task_id": 1}, 1)
 	})
+	t.Run("update relative reminder when start_date changes", func(t *testing.T) {
+		db.LoadAndAssertFixtures(t)
+		s := db.NewSession()
+		defer s.Close()
+
+		// given task with start_date and relative reminder for start_date
+		taskBefore := &Task{
+			Title:     "test",
+			ProjectID: 1,
+			StartDate: time.Date(2022, time.March, 8, 8, 5, 20, 0, time.Local),
+			Reminders: []*TaskReminder{
+				{
+					RelativeTo:     "start_date",
+					RelativePeriod: -60,
+				},
+			}}
+		err := taskBefore.Create(s, u)
+		assert.NoError(t, err)
+		err = s.Commit()
+		assert.NoError(t, err)
+		assert.Equal(t, time.Date(2022, time.March, 8, 8, 4, 20, 0, time.Local), taskBefore.Reminders[0].Reminder)
+
+		// when start_date is modified
+		task := taskBefore
+		task.StartDate = time.Date(2023, time.March, 8, 8, 5, 0, 0, time.Local)
+		task.ReminderDates = nil
+		err = task.Update(s, u)
+		assert.NoError(t, err)
+
+		// then reminder time is updated
+		assert.Equal(t, time.Date(2023, time.March, 8, 8, 4, 0, 0, time.Local), task.Reminders[0].Reminder)
+		err = s.Commit()
+		assert.NoError(t, err)
+	})
 }
 
 func TestTask_Delete(t *testing.T) {
@@ -487,9 +610,13 @@ func TestUpdateDone(t *testing.T) {
 			oldTask := &Task{
 				Done:        false,
 				RepeatAfter: 8600,
-				Reminders: []time.Time{
+				Reminders: []*TaskReminder{
-					time.Unix(1550000000, 0),
+					{
-					time.Unix(1555000000, 0),
+						Reminder: time.Unix(1550000000, 0),
+					},
+					{
+						Reminder: time.Unix(1555000000, 0),
+					},
 				},
 			}
 			newTask := &Task{
@@ -507,8 +634,8 @@ func TestUpdateDone(t *testing.T) {
 			}
 
 			assert.Len(t, newTask.Reminders, 2)
-			assert.Equal(t, expected1, newTask.Reminders[0])
+			assert.Equal(t, expected1, newTask.Reminders[0].Reminder)
-			assert.Equal(t, expected2, newTask.Reminders[1])
+			assert.Equal(t, expected2, newTask.Reminders[1].Reminder)
 			assert.False(t, newTask.Done)
 		})
 		t.Run("update start date", func(t *testing.T) {
@@ -585,22 +712,25 @@ func TestUpdateDone(t *testing.T) {
 					Done:        false,
 					RepeatAfter: 8600,
 					RepeatMode:  TaskRepeatModeFromCurrentDate,
-					Reminders: []time.Time{
+					Reminders: []*TaskReminder{
-						time.Unix(1550000000, 0),
+						{
-						time.Unix(1555000000, 0),
+							Reminder: time.Unix(1550000000, 0),
-					},
+						},
-				}
+						{
+							Reminder: time.Unix(1555000000, 0),
+						},
+					}}
 				newTask := &Task{
 					Done: true,
 				}
 				updateDone(oldTask, newTask)
 
-				diff := oldTask.Reminders[1].Sub(oldTask.Reminders[0])
+				diff := oldTask.Reminders[1].Reminder.Sub(oldTask.Reminders[0].Reminder)
 
 				assert.Len(t, newTask.Reminders, 2)
 				// Only comparing unix timestamps because time.Time use nanoseconds which can't ever possibly have the same value
-				assert.Equal(t, time.Now().Add(time.Duration(oldTask.RepeatAfter)*time.Second).Unix(), newTask.Reminders[0].Unix())
+				assert.Equal(t, time.Now().Add(time.Duration(oldTask.RepeatAfter)*time.Second).Unix(), newTask.Reminders[0].Reminder.Unix())
-				assert.Equal(t, time.Now().Add(diff+time.Duration(oldTask.RepeatAfter)*time.Second).Unix(), newTask.Reminders[1].Unix())
+				assert.Equal(t, time.Now().Add(diff+time.Duration(oldTask.RepeatAfter)*time.Second).Unix(), newTask.Reminders[1].Reminder.Unix())
 				assert.False(t, newTask.Done)
 			})
 			t.Run("start date", func(t *testing.T) {
@@ -678,23 +808,28 @@ func TestUpdateDone(t *testing.T) {
 				oldTask := &Task{
 					Done:       false,
 					RepeatMode: TaskRepeatModeMonth,
-					Reminders: []time.Time{
+					Reminders: []*TaskReminder{
-						time.Unix(1550000000, 0),
+						{
-						time.Unix(1555000000, 0),
+							Reminder: time.Unix(1550000000, 0),
-					},
+						},
-				}
+						{
+							Reminder: time.Unix(1555000000, 0),
+						},
+					}}
 				newTask := &Task{
 					Done: true,
 				}
 				oldReminders := make([]time.Time, len(oldTask.Reminders))
-				copy(oldReminders, oldTask.Reminders)
+				for i, r := range newTask.Reminders {
+					oldReminders[i] = r.Reminder
+				}
 
 				updateDone(oldTask, newTask)
 
 				assert.Len(t, newTask.Reminders, len(oldReminders))
 				for i, r := range newTask.Reminders {
-					assert.True(t, r.After(oldReminders[i]))
+					assert.True(t, r.Reminder.After(oldReminders[i]))
-					assert.NotEqual(t, oldReminders[i].Month(), r.Month())
+					assert.NotEqual(t, oldReminders[i].Month(), r.Reminder.Month())
 				}
 				assert.False(t, newTask.Done)
 			})

pkg/modules/migration/microsoft-todo/microsoft_todo.go

@@ -329,7 +329,9 @@ func convertMicrosoftTodoData(todoData []*project) (vikunjsStructure []*models.N
 					return nil, err
 				}
 
-				task.Reminders = []time.Time{reminder}
+				task.Reminders = []*models.TaskReminder{
+					{Reminder: reminder},
+				}
 			}
 
 			// Due Date

pkg/modules/migration/microsoft-todo/microsoft_todo_test.go

@@ -141,8 +141,10 @@ func TestConverting(t *testing.T) {
 						{
 							Task: models.Task{
 								Title: "Task 5",
-								Reminders: []time.Time{
+								Reminders: []*models.TaskReminder{
-									testtimeTime,
+									{
+										Reminder: testtimeTime,
+									},
 								},
 							},
 						},

pkg/modules/migration/ticktick/ticktick.go

@@ -147,8 +147,11 @@ func convertTickTickToVikunja(tasks []*tickTickTask) (result []*models.Namespace
 		}
 
 		if !t.DueDate.IsZero() && t.Reminder > 0 {
-			task.Task.Reminders = []time.Time{
+			task.Task.Reminders = []*models.TaskReminder{
-				t.DueDate.Add(t.Reminder * -1),
+				{
+					RelativeTo:     models.ReminderRelationDueDate,
+					RelativePeriod: int64((t.Reminder * -1).Seconds()),
+				},
 			}
 		}
 

pkg/modules/migration/ticktick/ticktick_test.go

@@ -101,7 +101,8 @@ func TestConvertTicktickTasksToVikunja(t *testing.T) {
 		{Title: "label1"},
 		{Title: "label2"},
 	})
-	//assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[0].Reminders, tickTickTasks[0].) // TODO
+	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[0].Reminders[0].RelativeTo, models.ReminderRelation("due_date"))
+	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[0].Reminders[0].RelativePeriod, int64(-24*3600))
 	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[0].Position, tickTickTasks[0].Order)
 	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[0].Done, false)
 
@@ -127,7 +128,8 @@ func TestConvertTicktickTasksToVikunja(t *testing.T) {
 		{Title: "label2"},
 		{Title: "other label"},
 	})
-	//assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[0].Reminders, tickTickTasks[0].) // TODO
+	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[2].Reminders[0].RelativeTo, models.ReminderRelation("due_date"))
+	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[2].Reminders[0].RelativePeriod, int64(-24*3600))
 	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[2].Position, tickTickTasks[2].Order)
 	assert.Equal(t, vikunjaTasks[0].Projects[0].Tasks[2].Done, false)
 

pkg/modules/migration/todoist/todoist.go

@@ -471,7 +471,10 @@ func convertTodoistToVikunja(sync *sync, doneItems map[string]*doneItem) (fullVi
 			return nil, err
 		}
 
-		tasks[r.ItemID].Reminders = append(tasks[r.ItemID].Reminders, date.In(config.GetTimeZone()))
+		tasks[r.ItemID].Reminders = append(tasks[r.ItemID].Reminders, &models.TaskReminder{
+			Reminder: date.In(config.GetTimeZone()),
+		},
+		)
 	}
 
 	return []*models.NamespaceWithProjectsAndTasks{

pkg/modules/migration/todoist/todoist_test.go

@@ -388,9 +388,9 @@ func TestConvertTodoistToVikunja(t *testing.T) {
 								Description: "Lorem Ipsum dolor sit amet",
 								Done:        false,
 								Created:     time1,
-								Reminders: []time.Time{
+								Reminders: []*models.TaskReminder{
-									time.Date(2020, time.June, 15, 23, 59, 0, 0, time.UTC).In(config.GetTimeZone()),
+									{Reminder: time.Date(2020, time.June, 15, 23, 59, 0, 0, time.UTC).In(config.GetTimeZone())},
-									time.Date(2020, time.June, 16, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone()),
+									{Reminder: time.Date(2020, time.June, 16, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone())},
 								},
 							},
 						},
@@ -407,8 +407,8 @@ func TestConvertTodoistToVikunja(t *testing.T) {
 								Title:   "Task400000002",
 								Done:    false,
 								Created: time1,
-								Reminders: []time.Time{
+								Reminders: []*models.TaskReminder{
-									time.Date(2020, time.July, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone()),
+									{Reminder: time.Date(2020, time.July, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone())},
 								},
 							},
 						},
@@ -421,8 +421,8 @@ func TestConvertTodoistToVikunja(t *testing.T) {
 								Created:     time1,
 								DoneAt:      time3,
 								Labels:      vikunjaLabels,
-								Reminders: []time.Time{
+								Reminders: []*models.TaskReminder{
-									time.Date(2020, time.June, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone()),
+									{Reminder: time.Date(2020, time.June, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone())},
 								},
 							},
 						},
@@ -441,8 +441,8 @@ func TestConvertTodoistToVikunja(t *testing.T) {
 								DueDate: dueTime,
 								Created: time1,
 								DoneAt:  time3,
-								Reminders: []time.Time{
+								Reminders: []*models.TaskReminder{
-									time.Date(2020, time.June, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone()),
+									{Reminder: time.Date(2020, time.June, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone())},
 								},
 							},
 						},
@@ -531,8 +531,8 @@ func TestConvertTodoistToVikunja(t *testing.T) {
 								Title:   "Task400000009",
 								Done:    false,
 								Created: time1,
-								Reminders: []time.Time{
+								Reminders: []*models.TaskReminder{
-									time.Date(2020, time.June, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone()),
+									{Reminder: time.Date(2020, time.June, 15, 7, 0, 0, 0, time.UTC).In(config.GetTimeZone())},
 								},
 							},
 						},

pkg/swagger/docs.go

@@ -1,5 +1,4 @@
-// Package swagger GENERATED BY SWAG; DO NOT EDIT
+// Code generated by swaggo/swag. DO NOT EDIT
-// This file was generated by swaggo/swag
 package swagger
 
 import "github.com/swaggo/swag"
@@ -7791,12 +7790,19 @@ const docTemplate = `{
                     ]
                 },
                 "reminder_dates": {
-                    "description": "An array of datetimes when the user wants to be reminded of the task.",
+                    "description": "An array of datetimes when the user wants to be reminded of the task.\n\nDeprecated: Use Reminders",
                     "type": "array",
                     "items": {
                         "type": "string"
                     }
                 },
+                "reminders": {
+                    "description": "An array of reminders that are associated with this task.",
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.TaskReminder"
+                    }
+                },
                 "repeat_after": {
                     "description": "An amount in seconds this task repeats itself. If this is set, when marking the task as done, it will mark itself as \"undone\" and then increase all remindes and the due date by its amount.",
                     "type": "integer"
@@ -8303,6 +8309,19 @@ const docTemplate = `{
                 "RelationKindCopiedTo"
             ]
         },
+        "models.ReminderRelation": {
+            "type": "string",
+            "enum": [
+                "due_date",
+                "start_date",
+                "end_date"
+            ],
+            "x-enum-varnames": [
+                "ReminderRelationDueDate",
+                "ReminderRelationStartDate",
+                "ReminderRelationEndDate"
+            ]
+        },
         "models.Right": {
             "type": "integer",
             "enum": [
@@ -8518,12 +8537,19 @@ const docTemplate = `{
                     ]
                 },
                 "reminder_dates": {
-                    "description": "An array of datetimes when the user wants to be reminded of the task.",
+                    "description": "An array of datetimes when the user wants to be reminded of the task.\n\nDeprecated: Use Reminders",
                     "type": "array",
                     "items": {
                         "type": "string"
                     }
                 },
+                "reminders": {
+                    "description": "An array of reminders that are associated with this task.",
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.TaskReminder"
+                    }
+                },
                 "repeat_after": {
                     "description": "An amount in seconds this task repeats itself. If this is set, when marking the task as done, it will mark itself as \"undone\" and then increase all remindes and the due date by its amount.",
                     "type": "integer"
@@ -8691,6 +8717,27 @@ const docTemplate = `{
                 }
             }
         },
+        "models.TaskReminder": {
+            "type": "object",
+            "properties": {
+                "relative_period": {
+                    "description": "A period in seconds relative to another date argument. Negative values mean the reminder triggers before the date. Default: 0, tiggers when RelativeTo is due.",
+                    "type": "integer"
+                },
+                "relative_to": {
+                    "description": "The name of the date field to which the relative period refers to.",
+                    "allOf": [
+                        {
+                            "$ref": "#/definitions/models.ReminderRelation"
+                        }
+                    ]
+                },
+                "reminder": {
+                    "description": "The absolute time when the user wants to be reminded of the task.",
+                    "type": "string"
+                }
+            }
+        },
         "models.TaskRepeatMode": {
             "type": "integer",
             "enum": [

pkg/swagger/swagger.json

@@ -7782,12 +7782,19 @@
                     ]
                 },
                 "reminder_dates": {
-                    "description": "An array of datetimes when the user wants to be reminded of the task.",
+                    "description": "An array of datetimes when the user wants to be reminded of the task.\n\nDeprecated: Use Reminders",
                     "type": "array",
                     "items": {
                         "type": "string"
                     }
                 },
+                "reminders": {
+                    "description": "An array of reminders that are associated with this task.",
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.TaskReminder"
+                    }
+                },
                 "repeat_after": {
                     "description": "An amount in seconds this task repeats itself. If this is set, when marking the task as done, it will mark itself as \"undone\" and then increase all remindes and the due date by its amount.",
                     "type": "integer"
@@ -8294,6 +8301,19 @@
                 "RelationKindCopiedTo"
             ]
         },
+        "models.ReminderRelation": {
+            "type": "string",
+            "enum": [
+                "due_date",
+                "start_date",
+                "end_date"
+            ],
+            "x-enum-varnames": [
+                "ReminderRelationDueDate",
+                "ReminderRelationStartDate",
+                "ReminderRelationEndDate"
+            ]
+        },
         "models.Right": {
             "type": "integer",
             "enum": [
@@ -8509,12 +8529,19 @@
                     ]
                 },
                 "reminder_dates": {
-                    "description": "An array of datetimes when the user wants to be reminded of the task.",
+                    "description": "An array of datetimes when the user wants to be reminded of the task.\n\nDeprecated: Use Reminders",
                     "type": "array",
                     "items": {
                         "type": "string"
                     }
                 },
+                "reminders": {
+                    "description": "An array of reminders that are associated with this task.",
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.TaskReminder"
+                    }
+                },
                 "repeat_after": {
                     "description": "An amount in seconds this task repeats itself. If this is set, when marking the task as done, it will mark itself as \"undone\" and then increase all remindes and the due date by its amount.",
                     "type": "integer"
@@ -8682,6 +8709,27 @@
                 }
             }
         },
+        "models.TaskReminder": {
+            "type": "object",
+            "properties": {
+                "relative_period": {
+                    "description": "A period in seconds relative to another date argument. Negative values mean the reminder triggers before the date. Default: 0, tiggers when RelativeTo is due.",
+                    "type": "integer"
+                },
+                "relative_to": {
+                    "description": "The name of the date field to which the relative period refers to.",
+                    "allOf": [
+                        {
+                            "$ref": "#/definitions/models.ReminderRelation"
+                        }
+                    ]
+                },
+                "reminder": {
+                    "description": "The absolute time when the user wants to be reminded of the task.",
+                    "type": "string"
+                }
+            }
+        },
         "models.TaskRepeatMode": {
             "type": "integer",
             "enum": [

pkg/swagger/swagger.yaml

@@ -196,11 +196,18 @@ definitions:
         - $ref: '#/definitions/models.RelatedTaskMap'
         description: All related tasks, grouped by their relation kind
       reminder_dates:
-        description: An array of datetimes when the user wants to be reminded of the
+        description: |-
-          task.
+          An array of datetimes when the user wants to be reminded of the task.
+
+          Deprecated: Use Reminders
         items:
           type: string
         type: array
+      reminders:
+        description: An array of reminders that are associated with this task.
+        items:
+          $ref: '#/definitions/models.TaskReminder'
+        type: array
       repeat_after:
         description: An amount in seconds this task repeats itself. If this is set,
           when marking the task as done, it will mark itself as "undone" and then
@@ -596,6 +603,16 @@ definitions:
     - RelationKindFollows
     - RelationKindCopiedFrom
     - RelationKindCopiedTo
+  models.ReminderRelation:
+    enum:
+    - due_date
+    - start_date
+    - end_date
+    type: string
+    x-enum-varnames:
+    - ReminderRelationDueDate
+    - ReminderRelationStartDate
+    - ReminderRelationEndDate
   models.Right:
     enum:
     - 0
@@ -763,11 +780,18 @@ definitions:
         - $ref: '#/definitions/models.RelatedTaskMap'
         description: All related tasks, grouped by their relation kind
       reminder_dates:
-        description: An array of datetimes when the user wants to be reminded of the
+        description: |-
-          task.
+          An array of datetimes when the user wants to be reminded of the task.
+
+          Deprecated: Use Reminders
         items:
           type: string
         type: array
+      reminders:
+        description: An array of reminders that are associated with this task.
+        items:
+          $ref: '#/definitions/models.TaskReminder'
+        type: array
       repeat_after:
         description: An amount in seconds this task repeats itself. If this is set,
           when marking the task as done, it will mark itself as "undone" and then
@@ -889,6 +913,22 @@ definitions:
         description: The ID of the "base" task, the task which has a relation to another.
         type: integer
     type: object
+  models.TaskReminder:
+    properties:
+      relative_period:
+        description: 'A period in seconds relative to another date argument. Negative
+          values mean the reminder triggers before the date. Default: 0, tiggers when
+          RelativeTo is due.'
+        type: integer
+      relative_to:
+        allOf:
+        - $ref: '#/definitions/models.ReminderRelation'
+        description: The name of the date field to which the relative period refers
+          to.
+      reminder:
+        description: The absolute time when the user wants to be reminded of the task.
+        type: string
+    type: object
   models.TaskRepeatMode:
     enum:
     - 0