HyperlinkedNestedRelatedField

gistfile1.py

class HyperlinkedNestedRelatedField(HyperlinkedRelatedField):

    def __init__(self, view_name, additional_reverse_kwargs, **kwargs):
        super(HyperlinkedNestedRelatedField, self).__init__(
            view_name,
            read_only=True,
            **kwargs
        )

        self.additional_reverse_kwargs = additional_reverse_kwargs

    def get_url(self, obj, view_name, request, format):
        if obj.pk is None:
            return None

        kwargs = {self.lookup_url_kwarg: getattr(obj, self.lookup_field)}
        for kwarg_name, field_name in self.additional_reverse_kwargs.items():
            try:
                parent_object = _resolve_object_attribute(obj, field_name)
            except AttributeError:
                #PKOnlyObject here. Since it's a mock object we can't directly getattr() of obj.
                if isinstance(self.root.instance, QuerySet):
                    parent_object = getattr(self.root.instance.get(pk=obj.pk), field_name)
                else:
                    parent_object = getattr(self.root.instance, field_name)
            kwargs[kwarg_name] = parent_object.pk

        url = self.reverse(
            view_name,
            kwargs=kwargs,
            request=request,
            format=format,
        )

        return url


def _resolve_object_attribute(object_, attribute_name):
    attribute = object_
    for attribute_name_part in attribute_name.split('.'):
        attribute = getattr(attribute, attribute_name_part)
    return attribute