Rails 这个是什么问题，google 都没用。。。

wxliuzifan · December 01, 2014 · Last by badboy replied at December 01, 2014 · 1535 hits

zlfera #1 December 01, 2014

你定义 Notifications 了没

badboy #2 December 01, 2014

google 解决不了你错别字，错误的大小写，甚至你漏写。。。

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