class UserPreference < ActiveRecord::Base
  self.primary_keys = "user_id", "k"

  belongs_to :user

  validates :user, :presence => true, :associated => true
  validates :k, :v, :length => 1..255

  # Turn this Node in to an XML Node without the <osm> wrapper.
  def to_xml_node
    el1 = XML::Node.new "preference"
    el1["k"] = k
    el1["v"] = v

    el1
  end
end