[Python] has_permission() missing 1 required positional argument: 'view'

i am working on a project for learning purpose with following config: Python 3.4.4 django==1.9.1 djangorestframework==3.3.3 OS (Windows 8.1)`

In project i having a model Post for that i have created permissions.py

from rest_framework import permissions


class IsAuthorOfPost(permissions.BasePermission):
def has_permission(self, request, view):
return True

def has_object_permission(self, request, view, post):
if request.user:
return post.author == request.user
return False

views.py:
​

from rest_framework import permissions, viewsets
from rest_framework.response import Response

from posts.models import Post
from posts.permissions import IsAuthorOfPost
from posts.serializers import PostSerializer


class PostViewSet(viewsets.ModelViewSet):
queryset = Post.objects.order_by('-created_at')
serializer_class = PostSerializer

def get_permissions(self):
if self.request.method in permissions.SAFE_METHODS:
return (permissions.AllowAny(),)
return (permissions.IsAuthenticated, IsAuthorOfPost(),)

def perform_create(self, serializer):
instance = serializer.save(author=self.request.user)
return super(PostViewSet, self).perform_create(serializer)


class AccountPostViewSet(viewsets.ModelViewSet):
queryset = Post.objects.select_related('author').all()
serializer_class = PostSerializer

def list(self, request, account_username=None):
queryset = self.queryset.filter(author__username=account_username)
serializer = self.serializer_class(queryset, many=True)

return Response(serializer.data)

serializers.py:
​

from rest_framework import serializers

from authentication.serializers import AccountSerializer
from posts.models import Post


class PostSerializer(serializers.ModelSerializer):
author = AccountSerializer(read_only=True, required=False)

class Meta:
model = Post
fields = ('id', 'author', 'content', 'created_at', 'updated_at')
read_only_fields = ('id', 'created_at', 'updated_at')

def get_validation_exclusions(self, *args, **kwargs):
exclusions = super(PostSerializer, self).get_validation_exclusions()

return exclusions + ['author']

urls.py
​

from django.conf.urls import url, include
from django.contrib import admin
from rest_framework.routers import DefaultRouter
from rest_framework_nested import routers

from djangular.views import IndexView
from authentication.views import AccountViewSet, LoginView, LogoutView
from posts.views import PostViewSet, AccountPostViewSet

router = routers.SimpleRouter()

router.register(r'accounts', AccountViewSet)
router.register(r'posts', PostViewSet)

account_router = routers.NestedSimpleRouter(
router, r'accounts', lookup='account'
)

account_router.register(r'posts', AccountPostViewSet)
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^api/v1/', include(router.urls)),
url(r'^api/v1/', include(account_router.urls)),
url(r'^api/v1/auth/login/$', LoginView.as_view(), name='login'),
url(r'^api/v1/auth/logout/$', LogoutView.as_view(), name='logout'),
url('^.*$', IndexView.as_view(), name='index'),
]


localhost:8000/api/v1/posts/

Error:
​

TypeError at /api/v1/posts/
has_permission() missing 1 required positional argument: 'view'
Request Method: GET
Request URL: http://localhost:8000/api/v1/posts/
Django Version: 1.9.1
Exception Type: TypeError
Exception Value:
has_permission() missing 1 required positional argument: 'view'
Exception Location: C:\Users\Devansh\Envs\19\lib\site-packages\rest_framework\views.py in check_permissions, line 318
Python Executable: C:\Users\Devansh\Envs\19\Scripts\python.exe
Python Version: 3.4.4
Python Path:
['D:\\djangular-app',
'C:\\Windows\\SYSTEM32\\python34.zip',
'C:\\Users\\Devansh\\Envs\\19\\DLLs',
'C:\\Users\\Devansh\\Envs\\19\\lib',
'C:\\Users\\Devansh\\Envs\\19\\Scripts',
'c:\\python34\\Lib',
'c:\\python34\\DLLs',
'C:\\Users\\Devansh\\Envs\\19',
'C:\\Users\\Devansh\\Envs\\19\\lib\\site-packages']

Traceback
​

Traceback (most recent call last):
File "C:\Users\Devansh\Envs\19\lib\site-packages\django\core\handlers\ba
, line 174, in get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Devansh\Envs\19\lib\site-packages\django\core\handlers\ba
, line 172, in get_response
response = response.render()
File "C:\Users\Devansh\Envs\19\lib\site-packages\django\template\respons
line 160, in render
self.content = self.rendered_content
File "C:\Users\Devansh\Envs\19\lib\site-packages\rest_framework\response
line 71, in rendered_content
ret = renderer.render(self.data, media_type, context)
File "C:\Users\Devansh\Envs\19\lib\site-packages\rest_framework\renderer
line 676, in render
context = self.get_context(data, accepted_media_type, renderer_context
File "C:\Users\Devansh\Envs\19\lib\site-packages\rest_framework\renderer
line 618, in get_context
raw_data_post_form = self.get_raw_data_form(data, view, 'POST', reques
File "C:\Users\Devansh\Envs\19\lib\site-packages\rest_framework\renderer
line 521, in get_raw_data_form
if not self.show_form_for_method(view, method, request, instance):
File "C:\Users\Devansh\Envs\19\lib\site-packages\rest_framework\renderer
line 417, in show_form_for_method
view.check_permissions(request)
File "C:\Users\Devansh\Envs\19\lib\site-packages\rest_framework\views.py
e 318, in check_permissions
if not permission.has_permission(request, self):
TypeError: has_permission() missing 1 required positional argument: 'view'

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