Implemented CanUpdate method

models/list_items_rights.go

@@ -0,0 +1,18 @@
+package models
+
+// CanDelete checks if the user can delete an item
+func (i *ListItem) CanDelete(doer *User) bool {
+	// A user can delete an item if he has write acces to its list
+	list, _ := GetListByID(i.ListID)
+	return list.CanWrite(doer)
+}
+
+// CanUpdate determines if a user has the right to update a list item
+func (i *ListItem) CanUpdate(doer *User, id int64) bool {
+	// Get the item
+	lI, _ := GetListItemByID(id)
+
+	// A user can update an item if he has write acces to its list
+	list, _ := GetListByID(lI.ListID)
+	return list.CanWrite(doer)
+}