[rails] How to use devise helper method before_action: authenticate_user!

about before_action: authenticate_user!

To briefly explain devise, it is a gem that does a login system.

The devise helper method authenticate_user! Method is a method that can be executed only by the logged-in user by describing it in the controller as before_action.

How to use before_action: authenticate_user!

Write the authenticate_user! method on the controller. Example

class PostsController < ApplicationController
  before_action :authenticate_user!

  def index
  end

end

If you write like this, only the logged-in user can process with posts_controller.

Allow unlogged-in users to perform some processing

Example

class PostsController < ApplicationController
  before_action :authenticate_user!, only: [:show]

  def index
  end

  def show
  end

end

By writing this way, you can prevent unlogged-in users from using only the show action.

I would appreciate it if you could point out any mistakes. Thank you for watching until the end.

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