Rails - Sep 2011 - accepts_nested_attributes_for is not working for uniqueness

class User < ActiveRecord::Base
  accepts_nested_attributes_for :emails,      :allow_destroy => true,   
:reject_if => proc { |attributes|
attributes[''address''].blank? }
end


class Email < ActiveRecord::Base
  belongs_to :user
  validates_presence_of :address
  validates_email_format_of :address
  validates_uniqueness_of :address, :scope=>''user_id''
end

when i am saving multiple same emails at one time it is saving , but it 
should not

Please suggest what i am missing 

Thanks
Rajeev sharma 

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