class Shoulda::ActiveRecord::Matchers::AllowMassAssignmentOfMatcher

def matches?(subject)
  @subject = subject
  if attr_mass_assignable?
    if whitelisting?
      @failure_message = "#{@attribute} was made accessible"
    else
      if protected_attributes.empty?
        @failure_message = "no attributes were protected"
      else
        @failure_message = "#{class_name} is protecting " <<
          "#{protected_attributes.to_a.to_sentence}, " <<
          "but not #{@attribute}."
      end
    end
    true
  else
    if whitelisting?
      @negative_failure_message =
        "Expected #{@attribute} to be accessible"
    else
      @negative_failure_message =
        "Did not expect #{@attribute} to be protected"
    end
    false
  end
end