Ruby-on-rails rails中未定义的方法“devise_for”
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undefined method `devise_for' in rails
提问by Yeddie
After I install devise and create a user model. I rake db:migrateand then I rake routes. I then get a error with "undefined method `devise_for' for #". What could be causing this error?
在我安装设计并创建一个用户模型之后。我rake db:migrate然后我rake routes。然后我收到“未定义的方法`devise_for' for #”的错误。什么可能导致此错误？
回答by Serge Paquet
Remember to restart your rails server after installing and configuring devise.
请记住在安装和配置设备后重新启动 Rails 服务器。
回答by Florin
If you have the Devise gem specified in the Gemfile, just make sure you have the following in your routes.rb file:
如果您在 Gemfile 中指定了 Devise gem，只需确保您的 routes.rb 文件中有以下内容：
devise_for :users
Also, here's a trick to make sure Devise is mapped properly, run: rails c, (the Rails app console) in your app's folder and then the following command line:
此外，这里有一个确保 Devise 被正确映射的技巧，在您的应用程序文件夹中运行：rails c,（Rails 应用程序控制台），然后运行以下命令行：
Devise.mappings.keys
You should see:
你应该看到：
=> [:user]
Cheers!
干杯!
回答by vich
Honestly, I would recommend following these two Railscasts (Episode 209and Episode 210). The first is a simple and very easy walkthrough for installing Devise and the second is about customizing it to fit your application.
老实说，我建议关注这两个 Railscast（第 209集和第 210 集）。第一个是安装 Devise 的简单且非常容易的演练，第二个是关于自定义它以适合您的应用程序。
I've watched both episodes and they drastically helped me with Devise, particularly with the customization.
我看过这两集，他们在设计方面极大地帮助了我，特别是在定制方面。
Your best bet is to start from scratch - you'll learn a heck of a lot and have Devise fully installed and functional.
您最好的选择是从头开始 - 您将学到很多东西，并且 Devise 已完全安装并正常运行。
Hope this helps! Good luck.
希望这可以帮助！祝你好运。
回答by Rishav Rastogi
You may need to do a bundle install
你可能需要做一个 bundle install
