Fix up quality errors in config model API.

common/djangoapps/config_models/models.py

@@ -94,7 +94,7 @@ class ConfigurationModel(models.Model):
         Clear the cached value when saving a new configuration entry
         """
         # Always create a new entry, instead of updating an existing model
-        self.pk = None
+        self.pk = None  # pylint: disable=invalid-name
         super(ConfigurationModel, self).save(*args, **kwargs)
         cache.delete(self.cache_key_name(*[getattr(self, key) for key in self.KEY_FIELDS]))
         if self.KEY_FIELDS:

common/djangoapps/config_models/tests.py

@@ -95,7 +95,7 @@ class ConfigurationModelTests(TestCase):
         self.assertEqual(rows[1].string_field, 'first')
         self.assertEqual(rows[1].is_active, False)
 
-    def test_always_insert(self, mock_cache):
+    def test_always_insert(self, __):
         config = ExampleConfig(changed_by=self.user, string_field='first')
         config.save()
         config.string_field = 'second'
@@ -297,7 +297,11 @@ class KeyedConfigurationModelTests(TestCase):
 
 @ddt.ddt
 class ConfigurationModelAPITests(TestCase):
+    """
+    Tests for the configuration model API.
+    """
     def setUp(self):
+        super(ConfigurationModelAPITests, self).setUp()
         self.factory = APIRequestFactory()
         self.user = User.objects.create_user(
             username='test_user',
@@ -319,7 +323,7 @@ class ConfigurationModelAPITests(TestCase):
 
         request = self.factory.post('/config/ExampleConfig', {"string_field": "string_value"})
         request.user = self.user
-        response = self.current_view(request)
+        __ = self.current_view(request)
 
         self.assertEquals("string_value", ExampleConfig.current().string_field)
         self.assertEquals(self.user, ExampleConfig.current().changed_by)
@@ -333,13 +337,14 @@ class ConfigurationModelAPITests(TestCase):
             response = self.current_view(request)
             self.assertEquals(201, response.status_code)
 
-            self.assertEquals(i+1, ExampleConfig.objects.all().count())
+            self.assertEquals(i + 1, ExampleConfig.objects.all().count())
             self.assertEquals(str(i), ExampleConfig.current().string_field)
 
     def test_get_current(self):
         request = self.factory.get('/config/ExampleConfig')
         request.user = self.user
         response = self.current_view(request)
+        # pylint: disable=no-member
         self.assertEquals('', response.data['string_field'])
         self.assertEquals(10, response.data['int_field'])
         self.assertEquals(None, response.data['changed_by'])

common/djangoapps/config_models/views.py

+"""
+API view to allow manipulation of configuration models.
+"""
 from rest_framework.generics import CreateAPIView, RetrieveAPIView
 from rest_framework.permissions import DjangoModelPermissions
 from rest_framework.authentication import SessionAuthentication
@@ -5,6 +8,7 @@ from rest_framework.serializers import ModelSerializer
 
 
 class ReadableOnlyByAuthors(DjangoModelPermissions):
+    """Only allow access by users with `add` permissions on the model."""
     perms_map = DjangoModelPermissions.perms_map.copy()
     perms_map['GET'] = perms_map['OPTIONS'] = perms_map['HEAD'] = perms_map['POST']
 
@@ -32,7 +36,9 @@ class ConfigurationModelCurrentAPIView(CreateAPIView, RetrieveAPIView):
     def get_serializer_class(self):
         if self.serializer_class is None:
             class AutoConfigModelSerializer(ModelSerializer):
-                class Meta:
+                """Serializer class for configuration models."""
+                class Meta(object):
+                    """Meta information for AutoConfigModelSerializer."""
                     model = self.model
 
             self.serializer_class = AutoConfigModelSerializer
@@ -41,4 +47,4 @@ class ConfigurationModelCurrentAPIView(CreateAPIView, RetrieveAPIView):
 
     def perform_create(self, serializer):
         # Set the requesting user as the one who is updating the configuration
-        serializer.save(changed_by = self.request.user)
+        serializer.save(changed_by=self.request.user)

common/test/acceptance/fixtures/config.py

+"""
+Fixture to manipulate configuration models.
+"""
 import requests
 import re
 import json
@@ -79,11 +82,11 @@ class ConfigModelFixture(object):
         if response.ok:
             # auto_auth returns information about the newly created user
             # capture this so it can be used by by the testcases.
-            user_pattern = re.compile('Logged in user {0} \({1}\) with password {2} and user_id {3}'.format(
-                '(?P<username>\S+)', '(?P<email>[^\)]+)', '(?P<password>\S+)', '(?P<user_id>\d+)'))
+            user_pattern = re.compile(r'Logged in user {0} \({1}\) with password {2} and user_id {3}'.format(
+                r'(?P<username>\S+)', r'(?P<email>[^\)]+)', r'(?P<password>\S+)', r'(?P<user_id>\d+)'))
             user_matches = re.match(user_pattern, response.text)
             if user_matches:
-                self.user = user_matches.groupdict()
+                self.user = user_matches.groupdict()  # pylint: disable=attribute-defined-outside-init
 
             return session