spree-contrib/spree_recently_viewed

module Spree::ProductsControllerDecorator
  def self.prepended(base)
    base.include Spree::RecentlyViewedProductsHelper
    base.helper_method [:cached_recently_viewed_products, :cached_recently_viewed_products_ids]
    base.before_action :set_current_order, except: :recently_viewed
    base.after_action :save_recently_viewed, only: :recently_viewed
  end

  def recently_viewed
    render 'spree/products/recently_viewed', layout: false
  end

  private

  def save_recently_viewed
    id = params[:product_id]
    return unless id.present?

    rvp = (cookies['recently_viewed_products'] || '').split(', ')
    rvp.delete(id)
    rvp << id unless rvp.include?(id.to_s)
    rvp_max_count = Spree::RecentlyViewed::Config.preferred_recently_viewed_products_max_count
    rvp.delete_at(0) if rvp.size > rvp_max_count.to_i
    cookies['recently_viewed_products'] = rvp.join(', ')
  end
end

Spree::ProductsController.prepend Spree::ProductsControllerDecorator