Revert "Use drf-yasg for Open API documentation"

common/djangoapps/course_modes/api/serializers.py

@@ -28,10 +28,6 @@ class CourseModeSerializer(serializers.Serializer):
     sku = serializers.CharField(required=False)
     bulk_sku = serializers.CharField(required=False)
 
-    class Meta(object):
-        # For disambiguating within the drf-yasg swagger schema
-        ref_name = 'course_modes.CourseMode'
-
     def create(self, validated_data):
         """
         This method must be implemented for use in our

common/djangoapps/entitlements/api/v1/tests/test_serializers.py

@@ -30,6 +30,7 @@ class EntitlementsSerializerTests(ModuleStoreTestCase):
             'course_uuid': str(entitlement.course_uuid),
             'mode': entitlement.mode,
             'refund_locked': False,
+            'enrollment_course_run': None,
             'order_number': entitlement.order_number,
             'created': entitlement.created.strftime('%Y-%m-%dT%H:%M:%S.%fZ'),
             'modified': entitlement.modified.strftime('%Y-%m-%dT%H:%M:%S.%fZ'),