809     def subject_relation_vocabulary(self, rtype, limit=None):

   810         """defaut vocabulary method for the given relation, looking for

   811         relation's object entities (i.e. self is the subject)

   812         """

   813         entity = self.entity

   814         if isinstance(rtype, basestring):

   815             rtype = entity.schema.rschema(rtype)

   816         done = None

   817         assert not rtype.is_final(), rtype

   818         if entity.has_eid():

   819             done = set(e.eid for e in getattr(entity, str(rtype)))

   820         result = []

   821         rsetsize = None

   822         for objtype in rtype.objects(entity.e_schema):

   823             if limit is not None:

   824                 rsetsize = limit - len(result)

   825             result += self.relation_vocabulary(rtype, objtype, 'subject',

   826                                                rsetsize, done)

   827             if limit is not None and len(result) >= limit:

   828                 break

   829         return result

   830 

   831     def object_relation_vocabulary(self, rtype, limit=None):

   832         """defaut vocabulary method for the given relation, looking for

   833         relation's subject entities (i.e. self is the object)

   834         """

   835         entity = self.entity

   836         if isinstance(rtype, basestring):

   837             rtype = entity.schema.rschema(rtype)

   838         done = None

   839         if entity.has_eid():

   840             done = set(e.eid for e in getattr(entity, 'reverse_%s' % rtype))

   841         result = []

   842         rsetsize = None

   843         for subjtype in rtype.subjects(entity.e_schema):

   844             if limit is not None:

   845                 rsetsize = limit - len(result)

   846             result += self.relation_vocabulary(rtype, subjtype, 'object',

   847                                                rsetsize, done)

   848             if limit is not None and len(result) >= limit:

   849                 break

   850         return result

   851 

   852     def relation_vocabulary(self, rtype, targettype, role,

   853                             limit=None, done=None):

   854         if done is None:

   855             done = set()

   856         req = self.req

   857         rset = entity.unrelated(rtype, targettype, role, limit)

   858         res = []

   859         for entity in rset.entities():

   860             if entity.eid in done:

   861                 continue

   862             done.add(entity.eid)

   863             res.append((entity.view('combobox'), entity.eid))

   864         return res

   865 

   866