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

Overview

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.

• This is the first article posted, so I'm sorry if it's hard to understand ...

What you can see in this article

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

Premise

Usage environment
ruby 2.5.7 rails 5.2.4

• Since devise is already installed, please refer to the following articles for the installation method. Reference page: I tried to summarize the setting procedure of Devise. Part 1 Introduction

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).