Remove post migrate handler with a default instance creation via Migration

admin_interface/apps.py

@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 from django.apps import AppConfig
-from django.db.models.signals import post_migrate
 
 from admin_interface.compat import gettext_lazy as _
 
@@ -15,7 +14,5 @@ class AdminInterfaceConfig(AppConfig):
     def ready(self):
 
         from admin_interface import settings
-        from admin_interface.models import Theme
 
         settings.check_installed_apps()
-        post_migrate.connect(Theme.post_migrate_handler, sender=self)

admin_interface/migrations/0001_initial.py

@@ -7,6 +7,9 @@
 
 
 class Migration(migrations.Migration):
+    def create_default_theme(apps, schema_editor):
+        Theme = apps.get_model("admin_interface", "Theme")
+        Theme.objects.create()
 
     dependencies = []
 
@@ -225,4 +228,5 @@ class Migration(migrations.Migration):
                 "verbose_name_plural": "Themes",
             },
         ),
+        migrations.RunPython(create_default_theme),
     ]

admin_interface/models.py

@@ -14,12 +14,6 @@
 
 @python_2_unicode_compatible
 class Theme(models.Model):
-    @staticmethod
-    def post_migrate_handler(**kwargs):
-        del_cached_active_theme()
-        db = kwargs["using"]
-        Theme.get_active_theme(database=db)
-
     @staticmethod
     def post_delete_handler(**kwargs):
         del_cached_active_theme()