gistfile1.txt

class Product
  
  include DataMapper::Resource
  include Paperclip::Resource
  
  property :id, Serial
  property :name, String, :nullable => false, :index => :unique
  
  property :description, String
  property :price, Float, :default=>0.0
  property :quantity, Integer, :default=>0
  property :position, Integer, :default=>0
  
  property :is_salable, Boolean, :default=>true
  property :is_public, Boolean, :default=>true
  property :has_free_shipping, Boolean, :default=>false
  property :has_unlimited_quantity, Boolean, :default=>false
  
  has n, :product_tags
  
  validates_is_unique :name
  validates_is_number :price
  validates_is_number :quantity
  validates_is_number :position
  
  has_attached_file :image_1, :styles => { :medium => "300x300>", :thumb => "100x100>" }
  
  after :save do |p|
    self.product_tags.save
  end
  
  def attrs_for_tags=(data)
    return if data.empty?
    data.each do |tag_id|
      next if product_tags.any?{|pt|pt.tag_id==tag_id.to_i}
      self.product_tags << ProductTag.new(:tag=>Tag.get(tag_id))
    end
  end
  
  def tag_ids_for_deleting=(ids)
    return if ids.empty?
    ids.each do |k,id|
      self.product_tags.each do |pt|
        self.product_tags.delete(pt) if id.to_i == pt.tag_id
      end
    end
  end
  
end