1
检索谷歌App Engine的实体,我有以下2种型号在我的谷歌App Engine数据存储:如何通过祖先
class Search(db.Model):
what = db.StringProperty()
class SearchResult(db.Model):
search = db.ReferenceProperty(Search)
title = db.StringProperty()
content = db.StringProperty()
而且,我试图检索给定的搜索实体的所有信息搜索结果的实体在以下功能:
def get_previous_search_results(what='', where=''):
search_results = None
search = db.GqlQuery("SELECT * FROM Search WHERE what = :1", what).fetch(1)
if search:
search_results = db.GqlQuery("SELECT * FROM SearchResult WHERE ANCESTOR IS :1", search[0].key()).fetch(10)
return search_results
但是,它总是返回一个空集。
任何想法我做错了什么?我已阅读了Python Datastore API docs,这看起来像是正确的方法,但它不起作用。
如果你想让'SearchResult'为'Search'的后代,你必须用'a_result = SearchResult(parent = a_search,...)创建它们' – 2010-04-21 15:32:18