Refactored sortable code into concern

product_sortable_listing.rb

module ProductSortableListing
  extend ActiveSupport::Concern

  private

  def sort_products_from_params(products)
    if params[:sort] == "product_name"
      if params[:direction] == "desc"
        products = products.order("products.name desc")
      else
        products = products.order("products.name asc")
      end
    elsif params[:sort] == "shop_code"
      if params[:direction] == "desc"
        products = products.order("products.final_article_number_cache desc")
      else
        products = products.order("products.final_article_number_cache asc")
      end
    else
      if ENV['SITE_ALIAS'].nil?
        # Sort based on product description for Stofzuigermarkt
        products = products.order("products.name")
      else
        products = products.order('products.final_article_number_cache')
      end
    end

    return products
  end

end