Remove post_migrate signal handler and multi db test.

admin_interface/apps.py

@@ -1,5 +1,4 @@
 from django.apps import AppConfig
-from django.db.models.signals import post_migrate
 from django.utils.translation import gettext_lazy as _
 
 
@@ -10,9 +9,6 @@ class AdminInterfaceConfig(AppConfig):
     default_auto_field = "django.db.models.AutoField"
 
     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/models.py

@@ -9,41 +9,30 @@ from .cache import del_cached_active_theme
 
 
 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()
-        db = kwargs["using"]
-        Theme.get_active_theme(database=db)
+        Theme.get_active_theme()
 
     @staticmethod
     def post_save_handler(instance, **kwargs):
         del_cached_active_theme()
-        db = kwargs["using"]
         if instance.active:
-            Theme.objects.using(db).exclude(pk=instance.pk).update(active=False)
-        Theme.get_active_theme(database=db)
+            Theme.objects.exclude(pk=instance.pk).update(active=False)
+        Theme.get_active_theme()
 
     @staticmethod
     def pre_save_handler(instance, **kwargs):
         if instance.pk is None:
-            db = kwargs["using"]
             try:
-                obj = Theme.objects.using(db).get(name=instance.name)
+                obj = Theme.objects.get(name=instance.name)
                 instance.pk = obj.pk
             except Theme.DoesNotExist:
                 pass
 
     @staticmethod
-    def get_active_theme(database=None):
-        objs_manager = (
-            Theme.objects if database is None else Theme.objects.using(database)
-        )
+    def get_active_theme():
+        objs_manager = Theme.objects
         objs_active_qs = objs_manager.filter(active=True)
         objs_active_ls = list(objs_active_qs)
         objs_active_count = len(objs_active_ls)