CouchPotato unique validation for couchdb

account.rb

class Account
  include CouchPotato::Persistence

  property :name

  view :by_name, :key => :name

  validates :name, :presence => true, :couch_unique => true

  before_validation :downcase_name

  private
    def downcase_name
      self.name = name.to_s.downcase
    end
end

couch_unique_validator.rb

class CouchUniqueValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    unless (CouchPotato.database.send(:view, record.class.send("by_#{attribute}", value.to_s.downcase)).blank?)
      record.errors[attribute] << (options[:message] || "has already been taken")
    end
  end
end