gistfile1.rb

class Asset < ActiveRecord::Base
  attr_accessible :caption, :attachment, :attachment_file_name, :attachment_content_type, :attachment_file_size, :attachment_updated_at
  
  has_attached_file :attachment, 
                    :styles => { :medium => "300x300>",
                                 :thumb => "100x100>" }                                   
                                 
  validates_attachment_presence :attachment
  validates_presence_of :account_id, :caption
  
  belongs_to :account
  
end