Implementation of user authentication function using devise (3)

New user registration

To save the information sent from the view in the User table Specify the instance variable and url of model in form_with.

registrations/new.html.erb

<%= form_with model:@user, url:"/users", local: true do |f| %>
　#abridgement
<% end %>

The @user specified in model: here is an instance variable based on the User model, and is declared in the devise controller. The devise controller is usually invisible, but it seems that you can generate it with the following command and customize it.

$ rails g devise:controllers users

The part of URI Pattern set in the following routing is specified in url :.

Prefix Verb   URI Pattern             Controller#Action                                                                 
       POST   /users(.:format)        devise/registrations#create

Also, if you want to save the information in a column other than email and password, you must allow saving in the column with the following description. In the example below, keys: [: username] is allowed to save to the username column during sign_up.

application_controller.rb

class ApplicationController < ActionController::Base
  before_action :configure_permitted_parameters, if: :devise_controller?

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.permit(:sign_up, keys: [:username])
  end
end

Reference: https://github.com/heartcombo/devise#strong-parameters

Log out

To implement the logout function, prepare a logout link on the view file as shown below.

<%= link_to 'Log out', destroy_user_session_path, method: :delete, class: "logout" %>

It is OK if you set path and method: in the same way as the routing setting.

Prefix               Verb   URI Pattern                Controller#Action
destroy_user_session DELETE /users/sign_out(.:format)  devise/sessions#destroy

Login

To implement the login function, prepare a login link on the view file as shown below.

<%= link_to 'Login', new_user_session_path, class: "login" %>

In the form of the view that prompts you to enter login information, write as follows.

sessions/new.html.erb

<%= form_with model:@user, url:user_session_path, class: 'registration-main', 
  #abridgement
<% end %>

Send request url: As you can see, When the login link is clicked, the new action of devise / sessions is executed and After entering the login information, when submitted, the create action of devise / sessions will be executed and you can log in.

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

Although it is a brief explanation, the minimum function of the user authentication function using devise has been implemented. Thank you for visiting.

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