Django Swagger shown HTTP Error 500 and not processed HTML code when accessing without logged in user

[civantos]

• Current versions installed in my app:

django-rest-swagger==2.0.1
djangorestframework==3.4.0

• Brief configuration:

-- urls.py --

router = DefaultRouter()
router.register(r'documents', DocumentViewSet)
router.register(r'bounces', BounceViewSet)
router.register(r'users', UserViewSet)

#DOC SWAGGER API
url(r'^documentacion/$', esquema_doc_api),

-- views.py --

@api_view()
@renderer_classes([SwaggerUIRenderer, OpenAPIRenderer])
def esquema_doc_api(request):
    generator = schemas.SchemaGenerator(title='TEST API')
    return response.Response(generator.get_schema(request=request))

-- development server petitions log --
[19/Jul/2016 09:36:00] "GET /documentacion/?format=openapi HTTP/1.1" 500 83970

Now if I launch my project and type http://ip:port/documentacion/ in my browser I get an HTTP error 500 and display raw HTML content inside my Swagger view. The problem disappears when I use a logged in user. Anyway when l use a logged in user I still can see and endpoint with the same name that my scheme creator function 'esquema_doc_api' and returns HTML when I fire the GET method on it. I'm not pretty sure if it's supposed to be the standard behaviour.

I'll attach some screenshot with the problem.

Regards,

Javier Civantos

[marcgibbons]

@civantos Could you provide the rendered error message? (can do so from the network tab).

I am guessing that if this only happens when the request is not provided in the schema generator, then it is possibly related to: encode/django-rest-framework#4278

[civantos]

AttributeError at /documentacion/
'dict' object has no attribute 'url'
Request Method: GET
Request URL:    http://192.168.112.105:8000/documentacion/?format=openapi
Django Version: 1.9.6
Exception Type: AttributeError
Exception Value:    
'dict' object has no attribute 'url'
Exception Location: /home/civan/tuvika/startup/local/lib/python2.7/site-packages/openapi_codec/encode.py in generate_swagger_object, line 8
Python Executable:  /home/civan/tuvika/startup/bin/python
Python Version: 2.7.9
Python Path:    
['/home/civan/tuvika/startup/startup',
 '/home/civan/tuvika/startup/lib/python2.7',
 '/home/civan/tuvika/startup/lib/python2.7/plat-x86_64-linux-gnu',
 '/home/civan/tuvika/startup/lib/python2.7/lib-tk',
 '/home/civan/tuvika/startup/lib/python2.7/lib-old',
 '/home/civan/tuvika/startup/lib/python2.7/lib-dynload',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/home/civan/tuvika/startup/local/lib/python2.7/site-packages',
 '/home/civan/tuvika/startup/lib/python2.7/site-packages']
Server time:    Mar, 19 Jul 2016 11:40:16 +0200


- Traceback

Environment:


Request Method: GET
Request URL: http://192.168.112.105:8000/documentacion/?format=openapi

Django Version: 1.9.6
Python Version: 2.7.9
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'rest_framework',
 'rest_framework_swagger',
 'fsm_admin',
 'django_cleanup',
 'import_export',
 'tabbed_admin',
 'corsheaders',
 'proyectos',
 'collab']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'corsheaders.middleware.CorsMiddleware']



Traceback:

File "/home/civan/tuvika/startup/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  174.                     response = self.process_exception_by_middleware(e, request)

File "/home/civan/tuvika/startup/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  172.                     response = response.render()

File "/home/civan/tuvika/startup/local/lib/python2.7/site-packages/django/template/response.py" in render
  160.             self.content = self.rendered_content

File "/home/civan/tuvika/startup/local/lib/python2.7/site-packages/rest_framework/response.py" in rendered_content
  70.         ret = renderer.render(self.data, media_type, context)

File "/home/civan/tuvika/startup/local/lib/python2.7/site-packages/rest_framework_swagger/renderers.py" in render
  19.         data = json.loads(codec.dump(data))

File "/home/civan/tuvika/startup/local/lib/python2.7/site-packages/openapi_codec/__init__.py" in dump
  34.         data = generate_swagger_object(document)

File "/home/civan/tuvika/startup/local/lib/python2.7/site-packages/openapi_codec/encode.py" in generate_swagger_object
  8.     parsed_url = urlparse.urlparse(document.url)

Exception Type: AttributeError at /documentacion/
Exception Value: 'dict' object has no attribute 'url'

[konradhalas]

I have the same problem, my stack:

Django==1.9.7
djangorestframework==3.4.0
django-rest-swagger==2.0.1

as a workaround, I required user to log in, before access docs.

[civantos]

from django.contrib.auth.decorators import login_required

@login_required()
@api_view()
@renderer_classes([SwaggerUIRenderer, OpenAPIRenderer])
def esquema_doc_api(request):
    generator = schemas.SchemaGenerator(title='TEST API')
    return response.Response(generator.get_schema(request=request))

Workaround works for me too, but there is still a warning about future function deprecations that may be related to this issue shown in my development server that I'm going to paste here so You can check:

/home/civan/tuvika/startup/local/lib/python2.7/site-packages/rest_framework_swagger/renderers.py:37: RemovedInDjango110Warning: render() must be called with a dict, not a RequestContext.
return template.render(context)

/usr/lib/python2.7/importlib/init.py:37: RemovedInDjango110Warning: django.core.context_processors is deprecated in favor of django.template.context_processors.
import(name)

[bschellekens]

I also got this and found a better solution (I think). The workaround you suggest to force login does not help our case, so I went into some debugging. Solved it by adding a permission_classes decorator. Might help for you.

The code:

from rest_framework.decorators import api_view, renderer_classes, permission_classes
from rest_framework import response, schemas, permissions
from rest_framework_swagger.renderers import OpenAPIRenderer, SwaggerUIRenderer

@api_view()
@permission_classes([permissions.AllowAny])
@renderer_classes([OpenAPIRenderer, SwaggerUIRenderer])
def schema_view(request):
    etc. etc.

[ewiger]

Apparently the difference is how the schema gets generated. Openapi gets generated as whole specification for every resources in the router. The error is thrown by the render that tries to dump a scheme for the whole router. Instead it gets serialized object as data param.

Correct way is to put schema-generation view as a separated url rule

url(r'^swagger/', schema_view),

[angvp]

I went with the solution proposed by @bschellekens and that remove that issue, but still I'm having this one: object has no attribute 'request' .

[tomchristie]

object has no attribute 'request' .

That's addressed here encode/django-rest-framework#4383 - new version 3.4.4 is due tomorrow. (Fri 12th Aug, 2016)

[angvp]

Awesome @tomchristie thanks!

[angvp]

Yep, confirming this can be closed with DRF 3.4.4

[tomchristie]

👍 great news, thanks for the update!

[karingula]

Hey guys,

whatever I do, still I'm having the same problem that Javier Civantos has showed in his First screenshot. Below is my error. would appreciate any help/suggestions--

18/Aug/2016 20:57:33] "GET /swagger/ HTTP/1.1" 403 3924
Internal Server Error: /swagger/
Traceback (most recent call last):
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner
response = get_response(request)
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/django/core/handlers/base.py", line 217, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/django/core/handlers/base.py", line 215, in _get_response
response = response.render()
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/django/template/response.py", line 109, in render
self.content = self.rendered_content
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/rest_framework/response.py", line 72, in rendered_content
ret = renderer.render(self.data, accepted_media_type, context)
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/rest_framework_swagger/renderers.py", line 16, in render
data = self.get_openapi_specification(data)
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/rest_framework_swagger/renderers.py", line 29, in get_openapi_specification
return json.loads(codec.dump(data))
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/openapi_codec/init.py", line 34, in dump
data = generate_swagger_object(document)
File "/Users/karingul/Virtualenvs/django_rest/lib/python2.7/site-packages/openapi_codec/encode.py", line 8, in generate_swagger_object
parsed_url = urlparse.urlparse(document.url)
AttributeError: 'dict' object has no attribute 'url'
[18/Aug/2016 20:57:33] "GET /swagger/?format=openapi HTTP/1.1" 500 84799

[marcgibbons]

@karingula Better exception handling is coming in 2.0.5 (#523). Hoping to release this weekend.