Added automatic check of 3rd party installed apps according to django version.

admin_interface/apps.py

@@ -11,7 +11,9 @@ 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/settings.py

@@ -0,0 +1,38 @@
+# -*- coding: utf-8 -*-
+
+import django
+from django.conf import settings
+from django.core.exceptions import ImproperlyConfigured
+
+
+def check_installed_apps():
+    dj_version = django.VERSION
+    installed_apps = settings.INSTALLED_APPS
+
+    if 'colorfield' not in installed_apps:
+        raise ImproperlyConfigured(
+            '\'colorfield\' needed, '
+            'add it to settings.INSTALLED_APPS.')
+
+    if dj_version < (1, 9):
+        if 'flat' not in installed_apps:
+            raise ImproperlyConfigured(
+                '\'flat\' needed before django 1.9, '
+                'add it to settings.INSTALLED_APPS.')
+    else:
+        if 'flat' in installed_apps:
+            raise ImproperlyConfigured(
+                '\'flat\' not needed since django 1.9, '
+                'remove it from settings.INSTALLED_APPS.')
+
+    if dj_version < (2, 0):
+        if 'flat_responsive' not in installed_apps:
+            raise ImproperlyConfigured(
+                '\'flat_responsive\' needed before django 2.0, '
+                'add it to settings.INSTALLED_APPS.')
+    else:
+        if 'flat_responsive' in installed_apps:
+            raise ImproperlyConfigured(
+                '\'flat_responsive\' not needed since django 2.0, '
+                'remove it from settings.INSTALLED_APPS.')
+