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檢索谷歌App Engine的實體,我有以下2種型號在我的谷歌App Engine數據存儲:如何通過祖先
class Search(db.Model):
what = db.StringProperty()
class SearchResult(db.Model):
search = db.ReferenceProperty(Search)
title = db.StringProperty()
content = db.StringProperty()
而且,我試圖檢索給定的搜索實體的所有信息搜索結果的實體在以下功能:
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,它總是返回一個空集。
任何想法我做錯了什麼?我已閱讀了Python Datastore API docs,這看起來像是正確的方法,但它不起作用。
如果你想讓'SearchResult'爲'Search'的後代,你必須用'a_result = SearchResult(parent = a_search,...)創建它們' – 2010-04-21 15:32:18