class Item < ActiveRecord::Base
  belongs_to :unit
  has_many :multi_media_descriptions
  belongs_to :sub_category
  belongs_to :supplier
  has_and_belongs_to_many :item_groups, :join_table => 'item_item_groups'

  validates_presence_of :name, :description, :list_price, :current_input_price, :tags, :unit_id, :code, :sub_category_id, :weight, :supplier_id


  # todo build a front end in backoffice (rails)
  def self.items_to_order
  	return Item.find_by_sql(%Q{
  		select s.name as supplier, i.name as item, sum(iic.count) amount, i.current_input_price 
  		from carts c 
  		join item_in_carts iic on iic.cart_id = c.id 
  		join items i on i.id = iic.item_id 
  		join suppliers s on i.supplier_id = s.id 
  		where c.confirmed and not (c.packed or c.delivered) 
  		group by s.name, i.name, i.current_input_price 
  		order by s.name, amount desc;
    })
  end


end