valid_attributes.rb

module ValidAttributes
  def valid_attributes?(*args)
    attributes = [*args].flatten.map { |e| e.to_s }
    valid? || (errors.keys & attributes).empty?
  end
  
  module Errors
    delegate :keys, :to => '@errors'
  end
end

ActiveRecord::Base.send :include, ValidAttributes
ActiveRecord::Errors.send :include, ValidAttributes::Errors