app/controllers/application_controller.rb

application_controller.rb

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception



  def admin_required
    current_user.admin?
  end
  
end

def admin_required
if !current_user.admin?
redirect_to root_path, alert: 'you are not admin!!'
end
end