django 1.10 fix (#516)

Fix django packages for 1.10, add docs noting django 1.8+ support.

oauth2client/contrib/django_orm.py

@@ -16,6 +16,9 @@
 
 Utilities for using OAuth 2.0 in conjunction with
 the Django datastore.
+
+
+Only Django versions 1.8+ are supported.
 """
 
 import oauth2client
@@ -31,7 +34,7 @@ from oauth2client.client import Storage as BaseStorage
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 
-class CredentialsField(six.with_metaclass(models.SubfieldBase, models.Field)):
+class CredentialsField(models.Field):
 
     def __init__(self, *args, **kwargs):
         if 'null' not in kwargs:
@@ -41,6 +44,9 @@ class CredentialsField(six.with_metaclass(models.SubfieldBase, models.Field)):
     def get_internal_type(self):
         return 'TextField'
 
+    def from_db_value(self, value, expression, connection, context):
+        return self.to_python(value)
+
     def to_python(self, value):
         if value is None:
             return None
@@ -68,7 +74,7 @@ class CredentialsField(six.with_metaclass(models.SubfieldBase, models.Field)):
         return self.get_prep_value(value)
 
 
-class FlowField(six.with_metaclass(models.SubfieldBase, models.Field)):
+class FlowField(models.Field):
 
     def __init__(self, *args, **kwargs):
         if 'null' not in kwargs:
@@ -78,6 +84,9 @@ class FlowField(six.with_metaclass(models.SubfieldBase, models.Field)):
     def get_internal_type(self):
         return 'TextField'
 
+    def from_db_value(self, value, expression, connection, context):
+        return self.to_python(value)
+
     def to_python(self, value):
         if value is None:
             return None

oauth2client/contrib/django_util/__init__.py

@@ -20,6 +20,7 @@ that user credentials are available, and an ``oauth_enabled`` decorator to check
 if the user has authorized, and helper shortcuts to create the authorization
 URL otherwise.
 
+Only Django versions 1.8+ are supported.
 
 Configuration
 =============

tests/contrib/test_django_orm.py

@@ -74,8 +74,20 @@ class TestCredentialsField(unittest.TestCase):
         self.assertEquals(self.field.get_internal_type(), 'TextField')
 
     def test_field_unpickled(self):
-        self.assertTrue(isinstance(self.field.to_python(self.pickle_str),
-                                   Credentials))
+        self.assertTrue(
+            isinstance(self.field.to_python(self.pickle_str), Credentials))
+
+    def test_field_already_unpickled(self):
+        self.assertTrue(isinstance(
+            self.field.to_python(self.credentials), Credentials))
+
+    def test_none_field_unpickled(self):
+        self.assertIsNone(self.field.to_python(None))
+
+    def test_from_db_value(self):
+        value = self.field.from_db_value(
+            self.pickle_str, None, None, None)
+        self.assertTrue(isinstance(value, Credentials))
 
     def test_field_unpickled_none(self):
         self.assertEqual(self.field.to_python(None), None)
@@ -120,6 +132,18 @@ class TestFlowField(unittest.TestCase):
         python_val = self.field.to_python(self.pickle_str)
         self.assertTrue(isinstance(python_val, Flow))
 
+    def test_field_already_unpickled(self):
+        self.assertTrue(
+            isinstance(self.field.to_python(self.flow), Flow))
+
+    def test_none_field_unpickled(self):
+        self.assertIsNone(self.field.to_python(None))
+
+    def test_from_db_value(self):
+        python_val = self.field.from_db_value(
+            self.pickle_str, None, None, None)
+        self.assertTrue(isinstance(python_val, Flow))
+
     def test_field_pickled(self):
         prep_value = self.field.get_db_prep_value(self.flow, connection=None)
         self.assertEqual(prep_value, self.pickle_str)