inscriptions automatiques aux tâches après migration

todo/migrations/0003_auto_20190512_1043.py

+# Generated by Django 2.2 on 2019-05-12 08:43
+
+from django.db import migrations
+
+
+def set_subscribers(apps, schema_editor):
+    db_alias = schema_editor.connection.alias
+    Task = apps.get_model("todo", "Task")
+    for task in Task.objects.using(db_alias).all():
+        task.subscribers.add(task.created_by)
+        if task.assigned_to:
+            task.subscribers.add(task.assigned_to)
+        for comment in task.comments.all():
+            task.subscribers.add(comment.author)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('todo', '0002_auto_20190511_1531'),
+    ]
+
+    operations = [
+        migrations.RunPython(set_subscribers),
+    ]