Task mentions (#926)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/926
Co-authored-by: konrad <konrad@kola-entertainments.de>
Co-committed-by: konrad <konrad@kola-entertainments.de>

pkg/notifications/database.go

@@ -33,6 +33,8 @@ type DatabaseNotification struct {
 	Notification interface{} `xorm:"json not null" json:"notification"`
 	// The name of the notification
 	Name string `xorm:"varchar(250) index not null" json:"name"`
+	// The thing the notification is about. Used to check if a notification for this thing already happened or not.
+	SubjectID int64 `xorm:"bigint null" json:"-"`
 
 	// When this notification is marked as read, this will be updated with the current timestamp.
 	ReadAt time.Time `xorm:"datetime null" json:"read_at"`
@@ -65,6 +67,13 @@ func GetNotificationsForUser(s *xorm.Session, notifiableID int64, limit, start i
 	return notifications, len(notifications), total, err
 }
 
+func GetNotificationsForNameAndUser(s *xorm.Session, notifiableID int64, event string, subjectID int64) (notifications []*DatabaseNotification, err error) {
+	notifications = []*DatabaseNotification{}
+	err = s.Where("notifiable_id = ? AND name = ? AND subject_id = ?", notifiableID, event, subjectID).
+		Find(&notifications)
+	return
+}
+
 // CanMarkNotificationAsRead checks if a user can mark a notification as read.
 func CanMarkNotificationAsRead(s *xorm.Session, notification *DatabaseNotification, notifiableID int64) (can bool, err error) {
 	can, err = s.

pkg/notifications/main_test.go

@@ -20,11 +20,10 @@ import (
 	"os"
 	"testing"
 
+	"code.vikunja.io/api/pkg/config"
 	"code.vikunja.io/api/pkg/db"
 	"code.vikunja.io/api/pkg/log"
 	"code.vikunja.io/api/pkg/mail"
-
-	"code.vikunja.io/api/pkg/config"
 )
 
 // SetupTests initializes all db tests

pkg/notifications/notification.go

@@ -29,6 +29,15 @@ type Notification interface {
 	Name() string
 }
 
+type SubjectID interface {
+	SubjectID() int64
+}
+
+type NotificationWithSubject interface {
+	Notification
+	SubjectID
+}
+
 // Notifiable is an entity which can be notified. Usually a user.
 type Notifiable interface {
 	// Should return the email address this notifiable has.
@@ -82,6 +91,10 @@ func notifyDB(notifiable Notifiable, notification Notification) (err error) {
 		Name:         notification.Name(),
 	}
 
+	if subject, is := notification.(SubjectID); is {
+		dbNotification.SubjectID = subject.SubjectID()
+	}
+
 	_, err = s.Insert(dbNotification)
 	if err != nil {
 		_ = s.Rollback()