[Answered ]-Django Tastypie – Filtering ToManyField resource with URL parameter

You can extend your attribute argument you’ve passed to the data field with a full-scale function and reuse the DataResource:

def filter_data_items(bundle):
    res = DataResource()
    new_bundle = Bundle(request=bundle.request)
    objs = res.obj_get_list(new_bundle)
    return objs.filter(parent_id=bundle.obj.pk)

res.obj_get_list handles building and applying filters as defined per your DataResource. You just need to filter it futher on parent_id.

Reference.