I am using devise plugin in my new Rails App. My issue is devise plugin has default roots for login and signup
/users/sign_in
/users/sign_up
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If I am reading and understanding your question correctly, you are after 'match'.
devise_for :users match "/login" => "devise/sessions#new" match "/signup" => "devise/registrations#new"
Be sure to have them in the correct order as they are matched based on line numbers in the file.
More can be found at: http://guides.rubyonrails.org/routing.html