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I am trying to serialize a collection of objects. I have define the following view method:
@csrf_exempt def venue_list(request, user_id): """ Check that the user is requesting his own venues. """ profile = get_profile_for_user_if_match(request.user, user_id) if profile is None: return HttpResponse(status=status.HTTP_401_UNAUTHORIZED) venues = profile.venue_set.all() serializer = VenueSerializer(venues) return JSONResponse(serializer.data) It receives a user_id parameter which is used to determine if the user has permissions to access the data, then it gets the set of objects to be returned, but it doesn't work.
It is trying to serialize the set directly, instead of the object inside it, so its throwing this traceback:
Traceback: File "/Users/mariopersonal/Documents/dev/offers/project/offers/venv/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 111. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/Users/mariopersonal/Documents/dev/offers/project/offers/venv/lib/python2.7/site-packages/django/views/decorators/csrf.py" in wrapped_view 57. return view_func(*args, **kwargs) File "/Users/mariopersonal/Documents/dev/offers/project/offers/wsgi/openshift/business/restful/views/venueViews.py" in venue_list 22. return JSONResponse(serializer.data) File "/Users/mariopersonal/Documents/dev/offers/project/offers/venv/lib/python2.7/site-packages/rest_framework/serializers.py" in data 572. self._data = self.to_native(obj) File "/Users/mariopersonal/Documents/dev/offers/project/offers/venv/lib/python2.7/site-packages/rest_framework/serializers.py" in to_native 351. value = field.field_to_native(obj, field_name) File "/Users/mariopersonal/Documents/dev/offers/project/offers/venv/lib/python2.7/site-packages/rest_framework/fields.py" in field_to_native 336. return super(WritableField, self).field_to_native(obj, field_name) File "/Users/mariopersonal/Documents/dev/offers/project/offers/venv/lib/python2.7/site-packages/rest_framework/fields.py" in field_to_native 207. value = get_component(value, component) File "/Users/mariopersonal/Documents/dev/offers/project/offers/venv/lib/python2.7/site-packages/rest_framework/fields.py" in get_component 58. val = getattr(obj, attr_name) Exception Type: AttributeError at /business/api/venues/1 Exception Value: 'QuerySet' object has no attribute 'name' How can I make this properly?
Thanks.
505
To serialize a queryset or list of objects instead of a single object instance, you should pass the many=True flag when instantiating the serializer. So in your case try this: ... venues = profile.
Creating and Using Serializers To create a basic serializer one needs to import serializers class from rest_framework and define fields for a serializer just like creating a form or model in Django.
Serializers allow complex data such as querysets and model instances to be converted to native Python datatypes that can then be easily rendered into JSON , XML or other content types.
It is not necessary to use a serializer. You can do what you would like to achieve in a view. However, serializers help you a lot. If you don't want to use serializer, you can inherit APIView at a function-based-view.
To serialize a queryset or list of objects instead of a single object instance, you should pass the many=True flag when instantiating the serializer. So in your case try this:
... venues = profile.venue_set.all() serializer = VenueSerializer(venues, many=True) ... If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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