apps.py

@@ -1,12 +1,7 @@
 from django.apps import AppConfig
-from django.db.models.signals import pre_delete
-from minecraft_manager.signals.pre_delete import attachment_delete
 
 
 class MinecraftManagerAppConfig(AppConfig):
     name = 'minecraft_manager'
     verbose_name = "Minecraft Manager"
 
-    def ready(self):
-        pre_delete.connect(attachment_delete)
-

models.py

@@ -1,10 +1,17 @@
-from django.db import models
-from django.contrib.auth.models import User
-from django.db.models import Q
-from os.path import basename
-import logging, yaml, pytz, json, os
-from django.conf import settings
+import json
+import logging
+import os
+import pytz
+import yaml
 from datetime import datetime
+from os.path import basename
+
+from django.conf import settings
+from django.contrib.auth.models import User
+from django.db import models
+from django.db.models import Q
+from django.db.models.signals import pre_delete
+from django.dispatch import receiver
 
 logger = logging.getLogger(__name__)
 
@@ -376,6 +383,11 @@ class Attachment(models.Model):
         return self.file.name
 
 
+@receiver(pre_delete, sender=Attachment, dispatch_uid="delete_attachments")
+def attachment_delete(sender, instance, **kwargs):
+    instance.file.delete(False)
+
+
 class IPManager(models.Manager):
     def get_queryset(self):
         users = User.objects.filter(is_active=True)

signals/pre_delete.py

@@ -1,2 +0,0 @@
-def attachment_delete(sender, instance, **kwargs):
-    instance.file.delete(False)