silverstripe-framework/tests/php/ORM/DataObjectTest/ValidatedObject.php

<?php

namespace SilverStripe\ORM\Tests\DataObjectTest;

use SilverStripe\Dev\TestOnly;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\ValidationResult;

class ValidatedObject extends DataObject implements TestOnly
{
	private static $table_name = 'DataObjectTest_ValidatedObject';

	private static $db = array(
		'Name' => 'Varchar(50)'
	);

	public function validate()
	{
		$result = ValidationResult::create();
		if (empty($this->Name)) {
			$result->addError("This object needs a name. Otherwise it will have an identity crisis!");
		}
		return $result;
	}
}