Ruby on Rails [Error memorandum] Routing Error No route matches [DELETE] "/ users / sign_out"

Prerequisites

ruby 2.5.1 Rails 5.2.4.4 Creating a Ruby on Rails video posting application for a school assignment.

Thing you want to do

** Logout ** with Devise feature.

Error status

1. I set "Logout" as shown below.

app/views/layouts/application.html/erb

 <% if user_signed_in? %>
        <div class="collapse navbar-collapse" id="Navber">
          <ul class="navbar-nav mr-auto">
            <li class="nav-item">
              <%= link_to 'My page', user_path, class: "nav-link" %>
            </li>
            <li class="nav-item">
                <%= link_to 'New post', new_movie_path, class: "nav-link" %>
            </li>
            <li class="nav-item">
                <%= link_to 'Post list', movies_path, class: "nav-link" %>
            </li>
            <li class="nav-item">
              <%= link_to "Log out", destroy_user_session_path, method: :delete, class: "nav-link" %>
            </li>
          </ul>
        </div>

2. Unfortunately, an error when logging out!

What i did

** 1. ** The route setting of the delete method seems to be an error. Check with rails routes.

rails routes

destroy_user_session GET /users/sign_out(.:format) devise/sessions#destroy                                          

that? The method is ** GET **!

** 2. ** Just in case, check the rails routes of other apps with devise for reference (this time, we will call it "sample").

rails routes(sample)

 destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy                                                               

It's ** DELETE **!

** 3. ** What's the difference? Check routes.rb!

routes.rb(sample)

delete  'tweets/:id'  => 'tweets#destroy'

routes.rb (code being created)

 resource :user, except: [:new, :create, :destroy]

...。 The sample is described by delete.

The code being created uses the resource method. And except: [: ** destroy **] ????

** 4. ** First, delete destroy of except: [: ** destroy **].

Error routes.rb

 resource :user, except: [:new, :create]

But when I log out, I get the same error.

** 5. ** Add the following! I think it's double with resourse ...

Error routes.rb

 delete 'users/:id' =>'users#destroy'

** 6. ** The error has changed! Only one line error.

** 7. ** Error says: "Cannot find destroy action for UsersController." Added the following and ** solved (no error, go to top screen after logging out!) **!

• I referred to Chapter 8 Section 3 "Logout" of the Ruby on Rails tutorial.

https://railstutorial.jp/chapters/log_in_log_out?version=4.2#sec-logging_out

app/controllers/users_controller.rb

 def destroy
        session.delete(:user_id)
        @current_user = nil
        redirect_to root_url

** 8. ** Check rails routes just in case.

destroy_user_session GET    /users/sign_out(.:format) devise/sessions#destroy                                                               

Hmm~. After all the method remained GET. There is a feeling of haze, but no error will occur, so we will resolve it.

I would be grateful if anyone could tell me this point (** Why can I log out even with GET? **)! !!

Summary

** Wrong (complete misunderstanding): **

• I thought that it was not necessary to destroy user, so I set resource: user, except: [: new,: create, **: destroy **]. Actually, you need destroy from sessions when you log out.

** Learning: **

• When using resource and specifying the action, pay attention to the combination with the controller.
• Be careful of omission of action description.

Reference: * Ruby on Rails Tutorial Chapter 8 Section 3 "Logout"

https://railstutorial.jp/chapters/log_in_log_out?version=4.2#sec-logging_out

That's it!

I hope it helps you solve the error!