class Product
  include SimplyStored::Couch

  property :name
  property :code
  property :price, type: Float

  #belongs_to :product_category
  has_and_belongs_to_many :product_categories, storing_keys: false
  belongs_to :supplier # direct! category is an aid
  has_many :product_orders

  attr_protected :supplier_id

  validates :name, presence: true
  validates :supplier_id, presence: true
  validates :price, presence: true, numericality: true

  after_save :persist_product_category_ids

  def product_category_ids=(ids)
    @product_category_ids = ids.select(&:present?)
  end

private
  def persist_product_category_ids
    return unless @product_category_ids.present?
    database.load(@product_category_ids).each do |product_category|
      product_category.product_ids ||= []
      product_category.product_ids |= [id]
      product_category.save
    end
  end

end