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V2EX  ›  ReferenceProperty
nttdocomo 如何判断一个ReferenceProperty里的集合是空的？
Google App Engine  •  nttdocomo  •  Sep 4, 2012
dofy 提问: GAE 如何做数据验证?
Google App Engine  •  dofy  •  Aug 2, 2010  •  Lastly replied by dofy 		4
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