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viewからcontrollerのメソッドをhelper_methodで呼び出す

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viewでもcontrollerのメソッドを使いたいときはhelper_methodを使う

controllerでhelper_methodを定義

application_controller.rb
class ApplicationController < ActionController::Base
  helper_method :current_user, :logged_in?

  private

  def current_user
    return unless session[:user_id]
    @current_user ||= User.find(session[:user_id])
  end

  def logged_in?
    !!session[:user_id]
  end
end

viewで呼び出し

home.html.erb
<%= current_user %>
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