问题
I want to create a many-to-many relationship where one person can be in many clubs and one club can have many persons. I added the models.py and serializers.py for the following logic but when I try to serialize it in the command prompt, I get the following error - What am I doing wrong here? I don't even have a HyperlinkedIdentityField
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "C:\Users\user\corr\lib\site-packages\rest_framework\serializers.py", line 503, in data
ret = super(Serializer, self).data
File "C:\Users\user\corr\lib\site-packages\rest_framework\serializers.py", line 239, in data
self._data = self.to_representation(self.instance)
File "C:\Users\user\corr\lib\site-packages\rest_framework\serializers.py", line 472, in to_representation
ret[field.field_name] = field.to_representation(attribute)
File "C:\Users\user\corr\lib\site-packages\rest_framework\relations.py", line 320, in to_representation"the serializer." % self.__class__.__name__
AssertionError: `HyperlinkedIdentityField` requires the request in the serializer context. Add `context={'request': request}` when instantiating the serializer.
models.py
class Club(models.Model):
club_name = models.CharField(default='',blank=False,max_length=100)
class Person(models.Model):
person_name = models.CharField(default='',blank=False,max_length=200)
clubs = models.ManyToManyField(Club)
serializers.py
class ClubSerializer(serializers.ModelSerializer):
class Meta:
model = Club
fields = ('url','id','club_name','person')
class PersonSerializer(serializers.ModelSerializer):
clubs = ClubSerializer()
class Meta:
model = Person
fields = ('url','id','person_name','clubs')
views.py
class ClubDetail(generics.ListCreateAPIView):
serializer_class = ClubSerializer
def get_queryset(self):
club = Clubs.objects.get(pk=self.kwargs.get('pk',None))
persons = Person.objects.filter(club=club)
return persons
class ClubList(generics.ListCreateAPIView):
queryset = Club.objects.all()
serializer_class = ClubSerializer
class PersonDetail(generics.RetrieveUpdateDestroyAPIView):
serializer_class = PersonSerializer
def get_object(self):
person_id = self.kwargs.get('pk',None)
return Person.objects.get(pk=person_id)
Inspecting the created serializer gives me this -
PersonSerializer(<Person: fd>):
url = HyperlinkedIdentityField(view_name='person-detail')
id = IntegerField(label='ID', read_only=True)
person_name = CharField(max_length=200, required=False)
clubs = ClubSerializer():
url = HyperlinkedIdentityField(view_name='club-detail')
id = IntegerField(label='ID', read_only=True)
club_name = CharField(max_length=100, required=False)
but serializer.data gives me the error
******************edit*********************
I realized the error could be because of url patterns, so I added the following url patterns but I still get the error -
urlpatterns = format_suffix_patterns([
url(r'^$', views.api_root),
url(r'^clubs/$',
views.ClubList.as_view(),
name='club-list'),
url(r'^clubs/(?P<pk>[0-9]+)/persons/$',
views.ClubDetail.as_view(),
name='club-detail'),
url(r'^person/(?P<pk>[0-9]+)/$',
views.PersonDetail.as_view(),
name='person-detail'),
])
回答1:
You're getting this error as the HyperlinkedIdentityField expects to receive request in context of the serializer so it can build absolute URLs. As you are initializing your serializer on the command line, you don't have access to request and so receive an error.
If you need to check your serializer on the command line, you'd need to do something like this:
from rest_framework.request import Request
from rest_framework.test import APIRequestFactory
from .models import Person
from .serializers import PersonSerializer
factory = APIRequestFactory()
request = factory.get('/')
serializer_context = {
'request': Request(request),
}
p = Person.objects.first()
s = PersonSerializer(instance=p, context=serializer_context)
print s.data
Your url field would look something like http://testserver/person/1/.
回答2:
I have two solutions...
urls.py
1) If you are using a router.register, you can add the base_name:
router.register(r'users', views.UserViewSet, base_name='users')
urlpatterns = [
url(r'', include(router.urls)),
]
2) If you have something like this:
urlpatterns = [
url(r'^user/$', views.UserRequestViewSet.as_view()),
]
You have to pass the context to the serializer:
views.py
class UserRequestViewSet(APIView):
def get(self, request, pk=None, format=None):
user = ...
serializer_context = {
'request': request,
}
serializer = api_serializers.UserSerializer(user, context=serializer_context)
return Response(serializer.data)
Like this you can continue to use the url on your serializer: serializers.py
...
url = serializers.HyperlinkedIdentityField(view_name="user")
...
回答3:
I came across the same problem. My approach is to remove 'url' from Meta.fields in serializer.py.
回答4:
Following Slipstream's answer, I edited my views.py introducing the context and now it works.
class UserViewSet(viewsets.ModelViewSet):
"""
API endpoint that allows users to be viewed or edited.
"""
queryset = User.objects.all().select_related('profile').order_by('-date_joined')
serializer_class = UserSerializer
@list_route(methods=['get'], url_path='username/(?P<username>\w+)')
def getByUsername(self, request, username):
serializer_context = {
'request': request,
}
user = get_object_or_404(User, username=username)
return Response(UserSerializer(user, context=serializer_context).data, status=status.HTTP_200_OK)
来源：https://stackoverflow.com/questions/34438290/assertionerror-hyperlinkedidentityfield-requires-the-request-in-the-serialize