user ( when repository allows it ) now could query by subfields
on a child collection
like ie for presentation.actions :
?filter=actions==type_id==1&&is_completed==0
that will return all presentation with action type id = 1 incompleted
Change-Id: I2dadb59bf5ed4243d9b9247707744af213b666b5
Signed-off-by: smarcet <smarcet@gmail.com>