old-ribica/back-office/app/models/item_in_cart.rb

class ItemInCart < ActiveRecord::Base
  belongs_to :cart
  belongs_to :item

  validates_uniqueness_of :item_id, scope: :cart_id
  validates :item_id, presence: true
  validates :cart_id, presence: true

  def name
    if item 
  	 item.name + " " + count.to_s + " " + price.to_s
    else 
      " no item "
    end
  end
end