- validates_presence_of :id, :version
- validates_length_of :k, :v, :maximum => 255, :allow_blank => true
- validates_uniqueness_of :id, :scope => [:k, :version]
- validates_numericality_of :id, :version, :only_integer => true
+ validates :old_node, :presence => true, :associated => true
+ validates :k, :v, :allow_blank => true, :length => { :maximum => 255 }
+ validates :k, :uniqueness => { :scope => [:node_id, :version] }