Model relations and Form::getValue quirks

Hello everyone. Pardon my lack of understanding over PHP.

I got a class that have a hasMany relation.

class MyModel
{
  public function initialize()
    {
        $this->hasMany('id', 'References', 'id_refs', ['alias' => 'refs']);
    }
}

I also have a controller that instantiate form with data from the model.

class MyController
{
  public function editAction($id)
    {
        $data = MyModel::findFirst();
        $form = new MyForm($data);

        // code in question below is put here
  }
}

• Why $form->getValue('refs') resolve to null?
• Even though $form->getEntity()->getRefs() and $form->getEntity()->refs resolve to the right value, why calling the latter makes $form->getValue('refs') resolve to the right value?

As for my setup, I'm using PHP 7.3.0 and Phalcon 3.4.2.

Thanks.