Hello.
This code is not for 1.7.6.x. We have already solved.
Example of code for 1.7.6.x, Category Page with new field (choices):
public function hookActionCategoryFormBuilderModifier(array $params)
{
$formBuilder = $params['form_builder'];
$formBuilder->add('ID_MODULE', ChoiceType::class, [
'label' => $this->getTranslator()->trans('YOUR FIELD NAME', [], 'Modules.MODULE'),
'required' => false,
'choices' => [
...
],
]);
$category_id = $params['id'];
$params['data']['ID_MODULE'] = $this->getCategoryBolhaId($category_id);
$formBuilder->setData($params['data']);
}
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