paperclip_define_style_size

class Photo < ActiveRecord::Base
  
  has_attached_file :file,    
    :storage => :s3,
    :s3_credentials => "#{Rails.root}/config/s3_credentials.yml",
    :bucket => 'hdphotos',
    :path => ":uid/:id/:token_:style.:extension",    
    :styles => {:thumb => '189x189#', :cover => '379x379#', :hd => '912x720>'},
    :convert_options => { :all => '-strip -colorspace RGB' }    
    
  belongs_to :user
  belongs_to :album, :counter_cache => true 
  
  after_post_process :define_sizes
  
  private
  def define_sizes    
    self.thumb_file_size = self.file.queued_for_write[:thumb].size
    self.cover_file_size = self.file.queued_for_write[:cover].size
    self.hd_file_size    = self.file.queued_for_write[:hd].size
  end 
end