class Shoulda::ActiveRecord::Matchers::ValidateUniquenessOfMatcher

def set_scoped_attributes
  unless @scopes.blank?
    @scopes.each do |scope|
      setter = :"#{scope}="
      unless @subject.respond_to?(setter)
        @failure_message =
          "#{class_name} doesn't seem to have a #{scope} attribute."
        return false
      end
      @subject.send("#{scope}=", @existing.send(scope))
    end
  end
  true
end