class RuboCop::Cop::Rails::BelongsTo

def autocorrect(node)
  opt = extract_required_option(node)
  return unless opt
  lambda do |corrector|
    if match_required_true?(opt)
      corrector.replace(opt.loc.expression, 'optional: false')
    elsif match_required_false?(opt)
      corrector.replace(opt.loc.expression, 'optional: true')
    end
  end
end