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.')
+

tests/settings.py

@@ -9,13 +9,25 @@ SECRET_KEY = 'django-admin-interface'
 
 ALLOWED_HOSTS = ['*']
 
+# Application definition
 INSTALLED_APPS = [
-
     'admin_interface',
-    'flat_responsive',
-    'flat', #if django version < 1.9
     'colorfield',
+]
 
+if django.VERSION < (1, 9):
+    # ONLY if django version < 1.9
+    INSTALLED_APPS += [
+        'flat',
+    ]
+
+if django.VERSION < (2, 0):
+    # ONLY if django version < 2.0
+    INSTALLED_APPS += [
+        'flat_responsive',
+    ]
+
+INSTALLED_APPS += [
     'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',

tests/test_settings.py

@@ -0,0 +1,92 @@
+# -*- coding: utf-8 -*-
+
+import django
+from django.conf import settings
+from django.core.exceptions import ImproperlyConfigured
+from django.test import override_settings, TestCase
+
+from admin_interface.settings import check_installed_apps
+
+
+class AdminInterfaceSettingsTestCase(TestCase):
+
+    DJANGO_APPS = [
+        'django.contrib.admin',
+        'django.contrib.auth',
+        'django.contrib.contenttypes',
+        'django.contrib.messages',
+        'django.contrib.sessions',
+    ]
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def __test_installed_apps(self):
+        dj_version = django.VERSION
+        installed_apps = settings.INSTALLED_APPS
+
+        if 'colorfield' not in installed_apps:
+            self.assertRaises(ImproperlyConfigured, check_installed_apps)
+
+        elif 'flat' not in installed_apps and dj_version < (1, 9):
+            self.assertRaises(ImproperlyConfigured, check_installed_apps)
+
+        elif 'flat' in installed_apps and dj_version >= (1, 9):
+            self.assertRaises(ImproperlyConfigured, check_installed_apps)
+
+        elif 'flat_responsive' not in installed_apps and dj_version < (2, 0):
+            self.assertRaises(ImproperlyConfigured, check_installed_apps)
+
+        elif 'flat_responsive' in installed_apps and dj_version >= (2, 0):
+            self.assertRaises(ImproperlyConfigured, check_installed_apps)
+
+        else:
+            check_installed_apps()
+
+    @override_settings(
+        INSTALLED_APPS = [
+            'admin_interface',
+            'colorfield',
+            'flat',
+            'flat_responsive',
+        ] + DJANGO_APPS
+    )
+    def test_installed_apps_all(self):
+        self.__test_installed_apps()
+
+    @override_settings(
+        INSTALLED_APPS = [
+            'admin_interface',
+            # 'colorfield',
+            'flat',
+            'flat_responsive',
+        ] + DJANGO_APPS
+    )
+    def test_installed_apps_no_colorfield(self):
+        self.__test_installed_apps()
+
+    @override_settings(
+        INSTALLED_APPS = [
+            'admin_interface',
+            'colorfield',
+            # 'flat',
+            'flat_responsive',
+        ] + DJANGO_APPS
+    )
+    def test_installed_apps_no_flat(self):
+        self.__test_installed_apps()
+
+    @override_settings(
+        INSTALLED_APPS = [
+            'admin_interface',
+            'colorfield',
+            'flat',
+            # 'flat_responsive',
+        ] + DJANGO_APPS
+    )
+    def test_installed_apps_no_flat_responsive(self):
+        self.__test_installed_apps()
+