api - django-tastypie user resource always null -

i can't figure out why userresource displaying null every object though verified_by_id correctly in database observation model.

relevant code:

model

class observation(projmodel):     verified_by = models.foreignkey(user, null=true)      class meta():         app_label = 'observation' 

resources

class observationresource(projresource):     verified_by = fields.foreignkey(userresource, 'user', full=true, null=true)      class meta:         queryset = observation.objects.all()         authentication = sessionauthentication()         authorization = djangoauthorization()         resource_name = 'observation'  class userresource(projresource):     class meta:         queryset = user.objects.all()         authentication = sessionauthentication()         authorization = djangoauthorization()         resource_name = 'user' 

json

"objects": [{"verified_by": null}] 

you need ensure referenced resources in url structure in order them appear.