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[Rails] Couldn't Find User With Id=sign_in

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Background

While using devise on rails3, I got the following error message.

    
      Couldn't Find User With Id=sign_in Devise on Rails 3
     
It was working yesterday, but not today.

Solution

I checked config/routes.rb, and had

    
      resources :users
      devise_for :users
     
which seemed to be interupting each other.
So I commented out resources :users, and it started to work fine.
I don’t know why it kept working till yesterday…

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