- validates_presence_of :id
- validates_length_of :k, :v, :within => 0..255, :allow_blank => true
+ validates_presence_of :node
+ validates_length_of :k, :maximum => 255, :allow_blank => true
+ validates_uniqueness_of :k, :scope => :node_id
+ validates_length_of :v, :maximum => 255, :allow_blank => true