document auth pattern: return None with resolve method (#1106)

* document auth pattern: return None with resolve method

* (doc, auth): also show that one can raise an exception in a resolve method
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Jason Kraus 2021-02-02 09:58:21 -08:00 committed by GitHub
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@ -48,6 +48,31 @@ conversely you can use ``exclude`` meta attribute.
exclude = ('published', 'owner')
interfaces = (relay.Node, )
Another pattern is to have a resolve method act as a gatekeeper, returning None
or raising an exception if the client isn't allowed to see the data.
.. code:: python
from graphene import relay
from graphene_django.types import DjangoObjectType
from .models import Post
class PostNode(DjangoObjectType):
class Meta:
model = Post
fields = ('title', 'content', 'owner')
interfaces = (relay.Node, )
def resolve_owner(self, info):
user = info.context.user
if user.is_anonymous:
raise PermissionDenied("Please login")
if not user.is_staff:
return None
return self.owner
Queryset Filtering On Lists
---------------------------