fix: DIA-783: Fix adding candidate task if it was accidentally delete…

…d from project (#5222)

* fix: DIA-783: Fix adding candidate task if it was accidentally deleted from the project

label_studio/data_manager/actions/basic.py

@@ -63,6 +63,9 @@ def delete_tasks(project, queryset, **kwargs):
         project.views.all().delete()
         reload = True
 
+    # Execute actions after delete tasks
+    Task.after_bulk_delete_actions(tasks_ids_list)
+
     return {'processed_items': count, 'reload': reload, 'detail': 'Deleted ' + str(count) + ' tasks'}
 
 

label_studio/tasks/mixins.py

@@ -14,6 +14,19 @@ def update_is_labeled(self, *args, **kwargs) -> None:
     def post_process_bulk_update_stats(cls, tasks) -> None:
         pass
 
+    def before_delete_actions(self):
+        """
+        Actions to execute before task deletion
+        """
+        pass
+
+    @staticmethod
+    def after_bulk_delete_actions(tasks_ids):
+        """
+        Actions to execute after bulk task deletion
+        """
+        pass
+
 
 class AnnotationMixin:
     def has_permission(self, user: 'User') -> bool:  # noqa: F821

label_studio/tasks/models.py

@@ -462,6 +462,12 @@ def delete_tasks_without_signals_from_task_ids(task_ids):
         queryset = Task.objects.filter(id__in=task_ids)
         Task.delete_tasks_without_signals(queryset)
 
+    def delete(self, *args, **kwargs):
+        self.before_delete_actions()
+        result = super().delete(*args, **kwargs)
+        # set updated_at field of task to now()
+        return result
+
 
 pre_bulk_create = Signal(providing_args=['objs', 'batch_size'])
 post_bulk_create = Signal(providing_args=['objs', 'batch_size'])