asset.rb

class Asset < ActiveRecord::Base
  include Helpers::AssetStorage
  
  
  before_validation :clear_asset
  belongs_to :ad, :polymorphic => true
  
  stores_file_as :image,
                    :styles => {:micro => "75x43", :thumb => "128x95", :medium => "300x300", :large => "500x500"}
  validates_attachment_presence :image
  validates_attachment_size :image, :less_than => 1.megabytes
  validates_attachment_content_type :image, :content_type => ['image/jpeg', 'image/gif', 'image/png']
  
  def delete_asset=(value)
    @delete_asset = !value.to_i.zero?
  end
  
  def delete_asset
    !!@delete_asset
  end
  
  alias_method :delete_asset?, :delete_asset
  
  def clear_asset
    self.image = nil if delete_asset? && !image.dirty?
  end
  
end

# == Schema Information
#
# Table name: assets
#
# id :integer not null, primary key
# ad_id :integer
# created_at :datetime
# updated_at :datetime
# image_file_name :string(255)
# image_content_type :string(255)
# image_file_size :integer
# image_updated_at :datetime
#