fix #171

rest_framework_swagger/introspectors.py

@@ -20,7 +20,7 @@
 
 
 def get_default_value(field):
-    default_value = getattr(field, 'default')
+    default_value = getattr(field, 'default', None)
     if rest_framework.VERSION >= '3.0.0':
         from rest_framework.fields import empty
         if default_value == empty:

rest_framework_swagger/tests.py

@@ -381,6 +381,15 @@ def test_get_serializer_fields_api_with_no_serializer(self):
 
         self.assertIsNone(fields)
 
+    def test_get_serializer_fields_with_field(self):
+        class SomeSerializer(serializers.Serializer):
+            thing1 = serializers.Field()
+
+        docgen = DocumentationGenerator()
+        fields = docgen._get_serializer_fields(SomeSerializer)
+
+        self.assertEqual(1, len(fields['fields']))
+
     def test_get_serializer_fields_api_with_nested(self):
         class SomeSerializer(serializers.Serializer):
             thing1 = serializers.CharField()