[RUBY] How to implement login request processing (Rails / for beginners)

Login request processing is a process to hide a specific page from users who are not logged in. This article is an easy solution to how to implement login request processing.

Prepare a helper in $ rails g helper sessions and implement current_user and logged_in?.


module SessionsHelper
  def current_user
    @current_user ||= User.find_by(id: session[:user_id])

  def logged_in?

def current_user is a method to get the currently logged in user.

@current_user ||= User.find_by(id: session[:user_id])Is If the current login user is assigned to @ current_user → Do nothing. If the current login user is not assigned to @ current_user → Get the login user fromUser.find_by (...)and assign it to @ current_user.

def logged_in? Returns true if the user is logged in, false if the user is not logged in.

Let's think about the controller.


class ApplicationController < ActionController::Base

  include SessionsHelper


  def require_user_logged_in
    unless logged_in?
      redirect_to login_url

The method written in ApplicationController can be used in all Controllers.

Define the require_user_logged_in method. The require_user_logged_in method checks the login status, does nothing if you are logged in, and forces you back to the login page if you are not logged in. The reason I wrote include SessionsHelper is to be able to use thelogged_in?Method defined in Helper.

Now let's use the require_user_logged_in method in UsersController.


class UsersController < ApplicationController
  before_action :require_user_logged_in, only: [:index, :show]

  #Omitted below

For the index and show specified in before_action, the require_user_logged_in method is executed as preprocessing.

For example, when a person accesses users # index, if that person logs in, they can see users # index. However, if you are not logged in, you will be taken to the login page. In this way, you can create membership-based services. that's all.

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