Do not attempt to generate a response schema for form-only requests

It would probably fail because Schema objects cannot represent files

src/drf_yasg/inspectors.py

@@ -225,6 +225,8 @@ class SwaggerAutoSchema(object):
             default_schema = self.get_request_serializer()
 
         default_schema = default_schema or ''
+        if any(is_form_media_type(encoding) for encoding in self.get_consumes()):
+            default_schema = ''
         if default_schema:
             if not isinstance(default_schema, openapi.Schema):
                 default_schema = self.serializer_to_schema(default_schema)

testproj/articles/views.py

@@ -54,7 +54,7 @@ class ArticleViewSet(viewsets.ModelViewSet):
         return Response(serializer.data)
 
     @swagger_auto_schema(method='get', operation_description="image GET description override")
-    @swagger_auto_schema(method='post', request_body=serializers.ImageUploadSerializer, responses={200: 'success'})
+    @swagger_auto_schema(method='post', request_body=serializers.ImageUploadSerializer)
     @detail_route(methods=['get', 'post'], parser_classes=(MultiPartParser,))
     def image(self, request, slug=None):
         """

tests/reference.yaml

@@ -187,8 +187,6 @@ paths:
       responses:
         '200':
           description: ''
-          schema:
-            $ref: '#/definitions/Article'
       consumes:
         - multipart/form-data
       tags:
@@ -221,8 +219,8 @@ paths:
           required: true
           type: file
       responses:
-        '200':
+        '201':
-          description: success
+          description: ''
       consumes:
         - multipart/form-data
       tags: