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Problem with category fombuilder module prestashop

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Im trying to create module that allows me to add categoryTree in category form, but I came across a problem. I don't know how to make inputs selected by default when creating hookActionCategoryFormBuilderModifier. Here is my code:

public function hookActionCategoryFormBuilderModifier(array $params) {
    $formBuilder = $params['form_builder'];
    $formBuilder->add('my_module', ChoiceCategoriesTreeType::class, array(
        'label' => 'test',
        'list' => Category::getNestedCategories(Category::getRootCategory()->id, $this->languageId, false),
        'multiple' => true,


I've benn trying to do something like this, but it doesn't work:

    $params['data']['my_module'][2] = true;

How can I make inputs selected by default? Thank you in advance for help.

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