self.primary_keys = "user_id", "k"
belongs_to :user
validates :user, :presence => true, :associated => true
validates :k, :v, :length => 1..255, :characters => true
self.primary_keys = "user_id", "k"
belongs_to :user
validates :user, :presence => true, :associated => true
validates :k, :v, :length => 1..255, :characters => true