idea of chaining error validations

gistfile1.rb

class UltraModel < ActiveRecord::Base

 validates_presence_of :super_id
 validates_format_of :super_id, :dependency => :super_id_presence
 validates_uniqueness_of :super_id, :dependency => :super_id_format
 validates :super_object_exist, :dependency => :super_id_uniqueness


private
 def super_object_exist
   ...
 end

end