Collection nested collection about doctrine-laminas-hydrator

[josemsalves]

https://github.com/josemsalves/testes

[driehle]

@josemsalves

I had a short look in your sample code, but the code under https://github.com/josemsalves/testes has several other (non-related) issues - a simple docker compose up -d doesn't get it running to repreduce the error you mentioned above. Please note that your application is outdated, as it is still using PHP 7.4. I recommend re-creating the project from the laminas-skeleton-application, to enable use of PHP 8.1.

Regarding your error message Call to a member function setValue() on null, you should provide a traceback to show the relevant class/method where the error occurs. One think that I see as problematic in your code snippets above is that you are creating the fieldsets with new ClassName(). Please take a look at the Laminas form documentation on how to use custom elements: https://docs.laminas.dev/laminas-form/v3/advanced/#creating-custom-elements. Elements should be created through the form factory, which initializes the elements correctly.

You should do something like this:

        $this->add([
            'type' => \Laminas\Form\Element\Collection::class,
            'name' => 'mySubFieldsetElement',
            'options' => [
                'allow_add' => true,
                'allow_remove' => true,
                'target_element' => [
                    'type' => \Application\Form\MySubFieldset::class,
                ],
            ],
        ]);

Or, in case you need the target element object itself, try this:

        $targetElement = $this->getFormFactory()->getFormElementManager()->get(\Application\Form\MySubFieldset::class);
        $this->add([
            'type' =>  \Laminas\Form\Element\Collection::class,
            'name' => 'mySubFieldsetElement',
            'options' => [
                'allow_add' => true,
                'allow_remove' => true,
                'target_element' => $targetElement,
            ],
        ]);