silverstripe-framework/tests/php/ORM/DataExtensionTest/CMSFieldsChild.php

<?php

namespace SilverStripe\ORM\Tests\DataExtensionTest;

use SilverStripe\Dev\TestOnly;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\TextField;
use SilverStripe\ORM\Tests\DataExtensionTest\CMSFieldsBase;

/**
 * Second level test class.
 * Tests usage of beforeExtendingCMSFields
 */
class CMSFieldsChild extends CMSFieldsBase implements TestOnly
{
	private static $table_name = 'DataExtensionTest_CMSFieldsChild';

	private static $db = array(
		'ChildField' => 'Varchar(255)',
		'ChildFieldBeforeExtension' => 'Varchar(255)'
	);

	public function getCMSFields()
	{
		$this->beforeExtending('updateCMSFields', function (FieldList $fields) {
			$fields->addFieldToTab('Root.Test', new TextField('ChildFieldBeforeExtension'));
		});

		$this->afterExtending('updateCMSFields', function (FieldList $fields) {
			$fields->removeByName('ExtendedFieldRemove', true);
		});

		$fields = parent::getCMSFields();
		$fields->addFieldToTab('Root.Test', new TextField('ChildField'));
		return $fields;
	}
}