user.json

{
    "url": "https://api.localhost:8000/users/3/", 
    "first_name": "Steven  ", 
    "last_name": "Konig", 
    "email": "stephen@example.com",
    "profile-image": "https://fbcdn-profile-a.akamaihd.net/profile_picture.jpg",
    "age": 36,
    "profiles": {
        "customer_profile_url": "https://api.localhost:8000/customers/3/",
        "vendor_profile_url": "https://api.localhost:8000/vendors/3/" 
    }
}, 

userserilaizer.py

class UserSerializer(serializers.HyperlinkedModelSerializer):

    def __init__(self, *args, **kwargs):
        super(UserSerializer, self).__init__(*args, **kwargs)
        trim_user_data = self.context['request'].QUERY_PARAMS.get('trim_user_data')

        if trim_user_data in ['true', '1', 'True']:
            allowed = set(['url', 'id', 'profiles'])
            existing = set(self.fields.keys())
            for field_name in existing - allowed:
                self.fields.pop(field_name)
            

    profiles = serializers.SerializerMethodField()


    def get_profiles(self, instance):
        profile_dict = {}

        if hasattr(instance, 'customerprofile'):
            e = CustomerProfileSerializer(instance.customerprofile, context=self.context)
            pdb.set_trace()
            profile_dict['customer_profile_url'] = e['url'].value


        if hasattr(instance, 'vendorprofile'):
            e = VendorProfileSerializer(instance.vendorprofile, context=self.context )  
            profile_dict['vendor_profile_url'] = e['url'].value
    
        return profile_dict

    class Meta:
        model = User
        fields =  ('url',
                   'id',
                   'first_name', 
                   'last_name',
                   'get_full_name',
                   'email', 

                   'profiles',
        )
        extra_kwargs={
                'url': 
                    {'view_name': 'user-detail'}
        }