django-tastypie: Loading fields based on request -

i have resources structure in tastypie similar following:

class userresource(modelresource):     class meta:         queryset = user.objects.all()  class activityresource(modelresource):     class meta:         queryset = activity.objects.all()  class useractivityresource(modelresource):     user = fields.toonefield(userresource, 'user')     activity = fields.toonefield(activityresource, 'activity', full=true)      class meta:         queryset = useractivity.objects.all()         filtering = {             'user': all_with_relations,             'activity': all_with_relations         } 

it many many objects relation.

sometimes want retrieve data useractivity using specific id object, gives me in result specific fields useractivity + user data related + activity data related, pretty good, example:

get /api/v1/user_activity/{user_activity_id}/ 

other times want retrieve data useractivity based on, example id of related user object, example:

get /api/v1/user_activity/?user={user_id} 

this request works pretty also.

now, let's {user_id} sent in request has 10 related activities (activityresource) in join object. so, when request execution, can notice system running following queries build result:

select count(*) user_activity {filters} (building meta...ok) 

and each activity related (10 times):

select user_activity.* user_activity {filters} (getting user_activity data...ok) select activity.* activity {filters} (getting activity data...ok) select user.* user id={user_id} (getting user data...ok?) 

the thing is, know user used find related activities, then, don't need query again data, , of course not interested in execute same query 10 times!

so, question is...

is there way optimize process, can activate/deactivate use of related field user depending on request avoid useless queries? or in other words, modify related objects of resource on fly ?

thank you.

btw: i'm using django1.4, django-tastypie 0.9.11