Helper Methods Module Pattern

demo.rb

# app/controllers/books_controller.rb
class BooksController < ApplicationController
  include HelperMethods::BooksController
  
  def index; end
  def show; end
end

# app/controllers/helper_methods/books_controller.rb
module HelperMethods
  module BooksController
    helper_methods :books, :book
    
    def books
      Book.active
    end
    
    def book
      Book.find(params[:id])
    end
  end
end