Devise admin routes

Question

I have a devise User and inside I have admin as boolean default to false. How can I fixed my routes in my ruby on rails app for it to give access to certain pages ONLY for the admin who has admin as true.

UPDATE: I changed followed the first answer I got which said to create a is_admin? method in my controller and specify what actions. However, when I do that, I get a:

undefined method `admin' for nil:NilClass

UPDATE 2:

Products Controller:

class ProductsController < ApplicationController
  before_action :is_admin?, only: [:edit, :update, :destroy]
  before_action :set_product, only: [:show]

Application Controller:

def is_admin?
  if signed_in?
    redirect_to root_path unless current_user.admin
  end
end

Answer 1

You shouldn't do that in the routes file, the best place to do it's on the controller filtering part. Attention to the :authenticate_user! method being before the is_admin?. Otherwise current_user will be nil.

class PagesController < ApplicationController
   before_action :authenticate_user!
   before_action :is_admin?, only: [:action1, :action2]
   ...
  
   private
   
   def is_admin?
     unless current_user.is_admin?
       flash.alert = "Sorry, you don't have permissions to perform this action."
       redirect_to root_path
     end
   end
end