Im following the RoR tutorial by Michael Hartl and im at chapter 9.3 "Showing all users" so far everything has worked great but now I am getting an undefined method `each' for nil:NilClass when trying to retrieve my users from the SQlite database. Here is my controllerIm following the RoR tutorial by Michael Hartl
阅读背景：
无法从我的db中获得用户，没有定义的方法为nil:NilClass " rails教程"
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