UpdateAPIView not working: Method "PATCH" not allowed

Question

I use Django along with Django REST Framework to implement a RESTful API.

What I have right now:

• A ContentEntry model
• A ContentEntryCreateUpdateSerializer serializer for my ContentEntry model
• A ContentEntryCreate view to create some ContentEntryies
• A ContentEntryUpdate view to update the ContentEntryies

Here is the code:

from django.db import models
from rest_framework import serializers
from rest_framework import generics
from rest_framework.views import APIView
from my_api_app import views


# models.py
class ContentEntry(models.Model):
    content = models.ForeignKey(Content)
    quantity = models.IntegerField()
    container = models.ForeignKey(Container, related_name='content_entries')


# serializers.py
class ContentEntryCreateUpdateSerializer(serializers.ModelSerializer):
    class Meta:
        model = ContentEntry
        fields = ('id', 'content', 'quantity', 'container')


# views.py
class ContentEntryCreate(generics.CreateAPIView):
    queryset = ContentEntry.objects.all()
    serializer_class = ContentEntryCreateUpdateSerializer


# views.py
class ContentEntryUpdate(generics.UpdateAPIView):
    queryset = ContentEntry.objects.all()
    lookup_field = 'id'
    serializer_class = ContentEntryCreateUpdateSerializer


# urls.py
urlpatterns = [
    url(r'content-entry', views.ContentEntryCreate.as_view()),
    url(r'content-entry/(?P<id>\d+)$', views.ContentEntryUpdate.as_view()),
]

Everything is working fine except the ContentEntryUpdate which always returns an error:

HTTP/1.1 405 Method Not Allowed
Allow: POST, OPTIONS
Content-Type: application/json
Date: Wed, 03 May 2017 14:40:03 GMT
Server: WSGIServer/0.2 CPython/3.6.1
Vary: Accept, Cookie
X-Frame-Options: SAMEORIGIN

{"detail":"Method \"PATCH\" not allowed."}

As you can see in the Allow attribute, it seems that only the POST and OPTIONS methods are allowed by the server.

It's very strange since generics.UpdateAPIView defines the put and patch methods.

I don't think it's a permission problem since I allow everything:

# settings.py
REST_FRAMEWORK = {
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.AllowAny'
    ]
}

What should I do to allow the HTTP PATCH and PUT methods?

Sub

Answer 1

Please make sure to mark the URLs with a start and end (^ and $ symbols).

What happens here is without the end mark, r'content-entry' matches "/content-entry/4/" and therefore calls the creation view.

Use: r'^content-entry$' and r'^content-entry/(?P<id>\d+)$' instead.

Ethiopia

Answer 2

If everything is correct and you are still encountering the issue, please make sure that you are supplying correct record id in the url that is you want to modify. You can confirm the record with 'GET' request first.

Sanjiv

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