CODEWITHSUNDEEP
pythondjango
Roil.Li
Roil.Li

Reputation: 31

Django self.renderer_classes object of type 'type' has no len()

I create a basic django rest project and follow the official tutorial.
When I called my API the following error message appears. Am I missing some settings?

object of type 'type' has no len()
Request Method: GET
Request URL:    http://localhost:8000/test
Django Version: 3.0.6
Exception Type: TypeError
Exception Value:    
object of type 'type' has no len()
Exception Location: D:\Projects\PythonProjects\poeRadar\venv\lib\site-packages\rest_framework\views.py in default_response_headers, line 158
Python Executable:  D:\Projects\PythonProjects\poeRadar\venv\Scripts\python.exe
Python Version: 3.6.5

Here is my code

setting.py

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
]

REST_FRAMEWORK = {
    'DEFAULT_RENDERER_CLASSES': (
        'rest_framework.renderers.JSONRenderer',
    ),
    'DEFAULT_PARSER_CLASSES': (
        'rest_framework.parsers.JSONParser',
    )
}

url.py

from django.conf.urls import url
from backend.api import views

urlpatterns = [
    url(r'^test$', views.test)
]

views.py

from rest_framework.response import Response
from rest_framework.decorators import api_view, renderer_classes
from rest_framework.renderers import JSONRenderer
import requests

@api_view(('GET',))
@renderer_classes((JSONRenderer))
def test(request):
    return Response({'a': 1})

Upvotes: 0

Views: 346

Answers (2)

minglyu
minglyu

Reputation: 3337

Seems you are missing a comma in @renderer_classes just as you did in @api_view

@api_view(('GET',))
@renderer_classes((JSONRenderer,))
def test(request):
    return Response({'a': 1})

Upvotes: 1

Aayush Agrawal
Aayush Agrawal

Reputation: 1394

You can't render a Response object, it's already rendered

Try this:

@api_view(('GET',))
def test(request):
    return JsonResponse({'a': 1})

Make sure to import JsonResponse

Upvotes: 1

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