Google App Engine 唯一=True？
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How do I define a unique property for a Model in Google App Engine?
I can't seems to find a way to work the unique property for a model. I followed How do I define a unique property for a Model in Google App Engine? and a couple other tutorials, but none seems to work?
What's the easiest way to make an unique property?
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最简单的方法是找到一种不同的方式来做你想做的事。 Google AppEngine 本身并不支持独特的属性，我所见过的所有实现它们的方法要么会带来痛苦，要么会破坏性能和可扩展性，这就是您应该首先使用它的原因。
The easiest way is to find a different way to do what you want. Google AppEngine does not natively support unique properties, and all of the ways that I have seen to implement them involve either pain or subverting the performance and scalability that are why you should be using it in the first place.