Proper password confirmation

en.yml

en:
  errors:
    messages:
      confirmation: "doesn't match %{attribute}"

model.rb

class User < ActiveRecord::Base
  class ConfirmationValidator < ActiveModel::EachValidator # :nodoc:
    def initialize(options)
      options[:attributes] = options[:attributes].map { |attribute| "#{attribute}_confirmation" }
      super
    end

    def validate_each(record, attribute, value)
      attribute_to_confirm = attribute.to_s.sub('_confirmation', '')
      confirmed = record.send(attribute_to_confirm)
      if value != confirmed
        human_attribute_name = record.class.human_attribute_name(attribute_to_confirm)
        record.errors.add(attribute, :confirmation, options.merge(:attribute => human_attribute_name))
      end
    end

    def client_side_hash(model, attribute, force = nil)
      attribute_to_confirm = attribute.to_s.split(/_confirmation/)[0]
      human_attribute_name = model.class.human_attribute_name(attribute_to_confirm)
      build_client_side_hash(model, attribute, self.options.dup.merge(:attribute => human_attribute_name))
    end

    def setup(klass)
      klass.send(:attr_accessor, *attributes.map do |attribute|
        attribute unless klass.method_defined?(attribute)
      end.compact)
    end
  end

  validates :password, :confirmation => true
end

Hi, it seems not work for me.
I'm using devise, and I followed your gist,

add

  = f.input :password, required: true, validate: { confirmation: true }
  = f.input :password_confirmation

the the confirmation validation was still fired on the password field

any ideas?

Did you find a solution for it??