1class Link < ActiveRecord::Base
 2  attr_accessible :url, :description, :title, :thumbnail_url
 3  validates :url,  :presence => true
 4  belongs_to :user
 5  acts_as_taggable
 6
 7  default_scope order("created_at DESC")
 8
 9  def to_param
10    "#{id}-#{heading.gsub(/[^a-z0-9]+/i, '-')}"
11  end 
12end