add signals

aggregator/apps.py

@@ -1,4 +1,5 @@
 from django.apps import AppConfig
+from django.db.models.signals import post_delete
 
 
 class AggregatorConfig(AppConfig):
@@ -6,9 +7,17 @@ class AggregatorConfig(AppConfig):
 
     def ready(self):
         self.register_config()
+        self.register_signals()
 
     def register_config(self):
         import djconfig
         from .forms import AggregatorAppConfigForm
 
         djconfig.register(AggregatorAppConfigForm)
+
+    def register_signals(self):
+        from .models import AggregationSource, Chat
+        from .signals import aggregation_source_deleted, chat_deleted
+
+        post_delete.connect(aggregation_source_deleted, sender=AggregationSource)
+        post_delete.connect(chat_deleted, sender=Chat)