'Varchar(50)', 'Category' => 'Varchar(50)', ]; private static $has_one = [ 'RootNode' => RootNode::class, ]; private static $has_many = [ 'LeafNodes' => LeafNode::class, ]; private static $summary_fields = [ 'Name', 'Category', ]; public function getNestedConfig(): GridFieldConfig { $config = new GridFieldConfig_RecordEditor(); $config->addComponent(GridFieldNestedForm::create()->setRelationName('LeafNodes')); return $config; } }