NoneType object has no attribute 'filter' when implementing custom view

[Ahtii]

Hi, I am creating a simple project that implements both GraphQL playground as well as a Custom view (which is queried from frontend with javascript fetch API).

GraphQL Playground works with all types (query, mutation and subscription) but the Custom view doesn't work with subscription (haven't tried mutation yet) i get the following error:

Traceback (most recent call last):
  File "mypath/django-graphql/venv/lib/python3.8/site-packages/graphql/execution/executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "mypath/django-graphql/venv/lib/python3.8/site-packages/graphql/execution/executors/sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "mypath/django-graphql/django_graphql/stock/graphql/subscription.py", line 49, in resolve_vehicle_updated
    return root.filter(
AttributeError: 'NoneType' object has no attribute 'filter'

I saw this suggestion so i added another path to my Custom View in routing.py:

application = ProtocolTypeRouter({
    "websocket": URLRouter([
        path('graphql', GraphqlSubscriptionConsumer),
        path('query', GraphqlSubscriptionConsumer)
    ]),
})

urls.py:

urlpatterns = [    
    path('', views.index, name='index'),  
    path('graphql', GraphQLView.as_view(graphiql=True)),
    path('query', views.query_graphql, name='query')  # Custom view
]

views.py

def index(request):
    return render(request, "index.html") 

def get_graphql_result_from(request):
    result = {}
    if request.method == 'POST':
        body_data = json.loads(request.body.decode("utf-8"))
        query = body_data['query']
        result = schema.execute(query, context_value=request, allow_subscriptions=True)                      
        result = result.data  
    return result

# Custom View
def query_graphql(request):
    result = get_graphql_result_from(request)        
    return JsonResponse(result, safe=False)  

I have also created a repo of the whole project : please check graphql_ui branch not master

[aliscie]

Hi, I am creating a simple project that implements both GraphQL playground as well as a Custom view (which is queried from frontend with javascript fetch API).

GraphQL Playground works with all types (query, mutation and subscription) but the Custom view doesn't work with subscription (haven't tried mutation yet) i get the following error:

Traceback (most recent call last):
  File "mypath/django-graphql/venv/lib/python3.8/site-packages/graphql/execution/executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "mypath/django-graphql/venv/lib/python3.8/site-packages/graphql/execution/executors/sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "mypath/django-graphql/django_graphql/stock/graphql/subscription.py", line 49, in resolve_vehicle_updated
    return root.filter(
AttributeError: 'NoneType' object has no attribute 'filter'

I saw this suggestion so i added another path to my Custom View in routing.py:

application = ProtocolTypeRouter({
    "websocket": URLRouter([
        path('graphql', GraphqlSubscriptionConsumer),
        path('query', GraphqlSubscriptionConsumer)
    ]),
})

urls.py:

urlpatterns = [    
    path('', views.index, name='index'),  
    path('graphql', GraphQLView.as_view(graphiql=True)),
    path('query', views.query_graphql, name='query')  # Custom view
]

views.py

def index(request):
    return render(request, "index.html") 

def get_graphql_result_from(request):
    result = {}
    if request.method == 'POST':
        body_data = json.loads(request.body.decode("utf-8"))
        query = body_data['query']
        result = schema.execute(query, context_value=request, allow_subscriptions=True)                      
        result = result.data  
    return result

# Custom View
def query_graphql(request):
    result = get_graphql_result_from(request)        
    return JsonResponse(result, safe=False)  

I have also created a repo of the whole project : please check graphql_ui branch not master

Can you share your repo , did you solved it?