Django Filtering based on field values in

I resolved the error. Actually The way of specifying how Product model's companyId references Id field of company model was wrong. So I saw How userprofile references user model .I am mentioning here my changes.

Product Model

class Product(models.Model):    name = models.CharField(max_length=200)    company = models.ForeignKey(Company,null=True)

View

class ListProducts(APIView):    authentication_classes = (authentication.TokenAuthentication,)    permission_classes = (permissions.IsAdminUser,)    model = Product    def get(self, request):        if request.user.is_authenticated():            userCompanyId = request.user.get_profile().companyId        products = Product.objects.filter(company = userCompanyId)        serializer = ProductSerializer(products,many=True)        return Response(serializer.data)

put company_id in Company data like this

{   "_id": ObjectId("5284ceaae9cfff79368e1f29"),   "company_id": "528458c4bbe7823947b6d2a3",   "name": "Apple Juice" }

Obviously your user profile model's companyId is not an integer field, so you should adjust your Product model to have a compatible companyId type. Oh and yes: don't you have a Company model ?

This line:

ProductSerializer(products)

Should be:

ProductSerializer(products, many=True)

Otherwise though your issue doesn't seem to be related to Django REST framework, just to the particular filter you're running not returning any results.

Double check that request.user.get_profile() is returning a correct profile, double check that userCompanyId is set correctly, and double check the number of results returned by Product.objects.filter(companyId__id__exact=userCompanyId).count().

I'd guess you either have userCompanyId set incorrectly, or there simply aren't any matching Product records.