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当客户端尝试检索位置时，我无法检索朋友的 ID 和昵称。id 和昵称（以及其他内容字段）存储在 User 表中，朋友关系存储在 Friend 表中。我一般是 SQLAlchemy 和 python 的新手，所以任何帮助都将不胜感激。

obj = encoders.to_json(self, Loc.LOC_JSON_ATTRS)

my_friend_ids = user.Friend.select_friend_ids(requestor_id)

friend_creators = session.query(user.User). \
              join(bc.Bc). \
              filter(and_(
                  user.User.id.in_(my_friend_ids),
                  requestor_id == bc.Bc.creator_id, 
                  self.id == bc.Bc.location_id)). \
              all()


obj['friend_list'] = [{'id': friend.id, 'nickname': friend.nickname} \
                     for friend in friend_creators]
#print obj
if not obj['friend_list']:
    print "empty"

else:
    obj['num_created'] = 0
    obj['num_phollowing'] = 0
    obj['num_collected'] = 0
    obj['friend_list'] = []
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