dav_base: cosmetics

dav_base/config/apps.py

@@ -4,6 +4,8 @@ import re
 from django.apps import AppConfig as _AppConfig
 from django.core.exceptions import ImproperlyConfigured
 
+from ..constants import DJANGO_MAIN_MODULE, MODULE_APP_SETTINGS_PREFIX
+
 logger = logging.getLogger(__name__)
 
 
@@ -18,18 +20,21 @@ class DefaultSetting:  # pylint: disable=too-few-public-methods
         self.validator = validator
 
     def validate(self, value):
-        if hasattr(self, 'validator') and self.validator is not None:
-            if callable(self.validator):
-                if not self.validator(value):
-                    raise ImproperlyConfigured('Validator callback {clb} returned False'.format(clb=self.validator))
-            else:
-                if not re.search(self.validator, value):
-                    raise ImproperlyConfigured('Does not match /{re}/'.format(re=self.validator))
+        if self.validator is None:
+            return
+        if callable(self.validator):
+            if not self.validator(value):
+                raise ImproperlyConfigured('Validator callback {clb} returned False'.format(clb=self.validator))
+        else:
+            if not re.search(self.validator, value):
+                raise ImproperlyConfigured('Does not match /{re}/'.format(re=self.validator))
 
 
 class AppSettings:  # pylint: disable=too-few-public-methods
     def __init__(self, app_name, defaults):
-        settings_name = 'main.settings-' + app_name
+        settings_name = '{main_module}.{prefix}{app_name}'.format(main_module=DJANGO_MAIN_MODULE,
+                                                                  prefix=MODULE_APP_SETTINGS_PREFIX,
+                                                                  app_name=app_name)
 
         try:
             settings_module = importlib.import_module(settings_name)