first commit

core/apps/accounts/signals/__init__.py

@@ -0,0 +1,3 @@
+from .likes import *  # noqa
+from .participant import *  # noqa
+from .user import *  # noqa

core/apps/accounts/signals/likes.py

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+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
+from core.apps.accounts.models import LikesModel
+
+
+@receiver(post_save, sender=LikesModel)
+def LikesSignal(sender, instance, created, **kwargs): ...

core/apps/accounts/signals/participant.py

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+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
+from core.apps.accounts.models import ParticipantModel
+
+
+@receiver(post_save, sender=ParticipantModel)
+def ParticipantSignal(sender, instance, created, **kwargs): ...

core/apps/accounts/signals/user.py

@@ -0,0 +1,10 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from django.contrib.auth import get_user_model
+
+
+@receiver(post_save, sender=get_user_model())
+def user_signal(sender, created, instance, **kwargs):
+    if created and instance.username is None:
+        instance.username = "U%(id)s" % {"id": 1000 + instance.id}
+        instance.save()