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Alter forms on modern pages


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Hi everyone! I'm developing a module that adds some fields to the product edit page in backoffice. So, the problem is that when i try this instructions https://devdocs.prestashop.com/1.7/modules/concepts/forms/admin-forms/ i'm not able to make it work.

The documentation says that now (>= 1.7.4), in any hook params we have the possibility to recover the form builder by this way:

$formBuilder = $hookParams['form_builder'];

So, i'm trying this:

public function hookDisplayAdminProductsMainStepLeftColumnBottom(&$hookParams)
{
	$formBuilder = $hookParams['form_builder'];
	dump($formBuilder); // returns NULL
}

But it always returns NULL. What could I be doing wrong?

 

PS: Also i'd tried to render a twig template in this hook but didn't found any documentation about how to get the twig instance to compile the template file (custom-fields.html.twig) that contains the custom fields.

--

Thanks for your help in advance.

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