silverstripe-framework/tests/php/Forms/GridField/GridFieldDetailFormTest/PeopleGroup.php

<?php

namespace SilverStripe\Forms\Tests\GridField\GridFieldDetailFormTest;

use SilverStripe\Dev\TestOnly;
use SilverStripe\Forms\GridField\GridField;
use SilverStripe\Forms\GridField\GridFieldConfig_RelationEditor;
use SilverStripe\ORM\DataObject;

class PeopleGroup extends DataObject implements TestOnly
{

	private static $table_name = 'GridFieldDetailFormTest_PeopleGroup';

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

	private static $has_many = array(
		'People' => Person::class
	);

	private static $belongs_many_many = array(
		'FavouritePeople' => Person::class
	);

	private static $default_sort = '"Name"';

	public function getCMSFields()
	{
		$fields = parent::getCMSFields();
		// TODO No longer necessary once FormScaffolder uses GridField
		$fields->replaceField('People',
			GridField::create('People', 'People',
				$this->People(),
				GridFieldConfig_RelationEditor::create()
			)
		);
		return $fields;
	}
}