+ # field_key is the name of one field in the record, typically 'researcher' for a 'slice' record
+ # hrns is the list of hrns that should be linked to the subject from now on
+ # target_type would be e.g. 'user' in the 'slice' x 'researcher' example
+ def update_relation (self, record_obj, field_key, hrns, target_type):
+ # locate the linked objects in our db
+ subject_type=record_obj.type
+ subject_id=record_obj.pointer
+ # get the 'pointer' field of all matching records
+ link_id_tuples = dbsession.query(RegRecord.pointer).filter_by(type=target_type).filter(RegRecord.hrn.in_(hrns)).all()
+ # sqlalchemy returns named tuples for columns
+ link_ids = [ tuple.pointer for tuple in link_id_tuples ]
+ self.driver.update_relation (subject_type, target_type, subject_id, link_ids)
+
+ def Register(self, api, record_dict):