/**
* Returns a form instance.
*
* @param mixed $id
* @param \Closure $callback
* @return \Illuminate\Support\Collection
*/
public function form($id, Closure $callback = null)
{
if (!($form = $this->find($id))) {
$this->put($id, $form = new Form($id));
}
$form->executeCallback($callback);
return $form;
}
