sortablegridfield/docs/HasManyExample.md

has_many Example

/*** TestPage.php ***/
class TestPage extends Page {
	private static $has_many = array(
		'TestObjects' => 'TestObject',
	);
	
	public function getCMSFields() {
		$fields = parent::getCMSFields();
		
		$conf = GridFieldConfig_RelationEditor::create(10);
		$conf->addComponent(new GridFieldSortableRows('SortOrder'));
		
		$fields->addFieldToTab('Root.TestObjects', new GridField('TestObjects', 'TestObjects', $this->TestObjects(), $conf));
		
		return $fields;
	}
}


/*** TestObject.php ***/
class TestObject extends DataObject {
	private static $db = array(
		'Title' => 'Text',
		'SortOrder' => 'Int',
	);
    
    private static $has_one = array(
        'Parent' => 'TestPage',
    );
	
	private static $default_sort = 'SortOrder';
}