class Shoulda::Matchers::ActiveRecord::HaveReadonlyAttributeMatcher

def matches?(subject)
  @subject = subject
  if readonly_attributes.include?(@attribute)
    @failure_message_for_should_not = "Did not expect #{@attribute} to be read-only"
    true
  else
    if readonly_attributes.empty?
      @failure_message_for_should = "#{class_name} attribute #{@attribute} " <<
        'is not read-only'
    else
      @failure_message_for_should = "#{class_name} is making " <<
        "#{readonly_attributes.to_a.to_sentence} " <<
        "read-only, but not #{@attribute}."
    end
    false
  end
end