[RUBY] [Rails 5] How to display the password change screen when using devise


When I introduced devise in Rails5, I had a problem that the password change screen generated by devise could not be displayed properly, so I will leave it as a memorandum.

What you can see in this article

--How to display the password change screen before and after logging in to devise


Usage environment
ruby 2.5.7 rails 5.2.4

Display method

Check devise routing

After installing devise, if you check the routing using the "rails routes" command on the console, it will be displayed in the following form.

$ rails routes
                   Prefix Verb   URI Pattern                                                                              Controller#Action
         new_user_session GET    /users/sign_in(.:format)                                                                 devise/sessions#new
             user_session POST   /users/sign_in(.:format)                                                                 devise/sessions#create
     destroy_user_session DELETE /users/sign_out(.:format)                                                                devise/sessions#destroy
        new_user_password GET    /users/password/new(.:format)                                                            devise/passwords#new
       edit_user_password GET    /users/password/edit(.:format)                                                           devise/passwords#edit
            user_password PATCH  /users/password(.:format)                                                                devise/passwords#update
                          PUT    /users/password(.:format)                                                                devise/passwords#update
                          POST   /users/password(.:format)                                                                devise/passwords#create
 cancel_user_registration GET    /users/cancel(.:format)                                                                  devise/registrations#cancel
    new_user_registration GET    /users/sign_up(.:format)                                                                 devise/registrations#new
   edit_user_registration GET    /users/edit(.:format)                                                                    devise/registrations#edit
        user_registration PATCH  /users(.:format)                                                                         devise/registrations#update
                          PUT    /users(.:format)                                                                         devise/registrations#update
                          DELETE /users(.:format)                                                                         devise/registrations#destroy
                          POST   /users(.:format)                                                                         devise/registrations#create

At this time, the routing for displaying the password change screen is

edit_user_password GET    /users/password/edit(.:format)  

It may seem like (I did), but there is actually another routing for the change screen. that is

edit_user_registration GET    /users/edit(.:format)

is. The difference between the two is

edit_user_password GET    /users/password/edit(.:format)  #Password change screen before login
edit_user_registration GET    /users/edit(.:format)  #Password change screen after login

... apparently ...

Let's use each correctly, such as specifying the path in "link_to" (although I feel that I basically use only the one after login).

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