gistfile1.py

class IdeaResource(ModelResource):
    comments = fields.ToManyField('atizo.apps.ideas.api.IdeaCommentResource', 'ideacomment_set')
    def override_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/(?P<pk>\w[\w/-]*)/children%s$" % (self._meta.resource_name, trailing_slash()), 
                self.wrap_view('get_children'), name="api_get_children"
            ),
        ]
        
    def get_children(self, request, **kwargs):
        try:
            obj = self.cached_obj_get(request=request, **self.remove_api_resource_names(kwargs))
        except ObjectDoesNotExist:
            return HttpGone()
        except MultipleObjectsReturned:
            return HttpMultipleChoices("More than one resource is found at this URI.")

        child_resource = IdeaCommentResource()
        return child_resource.get_detail(request, idea=obj.pk)
    
    class Meta:
        resource_name = 'ideas'
        queryset = Idea.objects.all()

class IdeaCommentResource(ModelResource):
    idea = fields.ForeignKey('atizo.apps.ideas.api.IdeaResource', 'idea')
    class Meta():
        resource_name = 'comments'
        queryset = IdeaComment.objects.all()
        filtering = {
            'idea': ALL_WITH_RELATIONS,
        }