[RUBY] [Rails] devise helper method

1. Introduction

Make a note of the useful helper methods you can use when deploying devise.

2. Helper method

Method function
before_action :authenticate_user! Allow access only to logged-in users
current_user Get the currently logged in user
user_signed_in? Determine if the user is signed in
user_session Access user session information

3.before_action :authenticate_user! This method switches the page to be displayed depending on the login status. If the user is not logged in, the user will be transitioned to the login screen. By calling before_action, you can transition to the login screen if you have not logged in before executing the action.


class ArticlesController < ApplicationController
  before_action :authenticate_user!

  def index

  def show

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