prestashop multiple checkboxes do not save values

Question

I can't figure out why the checkbox values are not saved in the database using helpers.

Trying to save some customers ids from my module's setting :

The array :

$custs = Customer::getCustomers();
foreach ($custs as $key => $value) {
  $options[] = array(
        'id_customer' => (int)$value['id_customer'],
        'infos' => $value['firstname'].' '.$value['lastname'].' | '.$value['email']
    );
}

The checkboxes :

'input' => array(
        array(
            'type' => 'checkbox',
            'label' => $this->l('Customers'),
            'desc' => $this->l('Select the Customers.'),
            'name' => 'MY_MODULE_CUSTOMERS',
            'values' => array(
                'query' => $options,
                'id' => 'id_customer',
                'name' => 'infos',
            ),
        ),
)

The $_POST is always empty but works well with another input. Any help will be appreciated.

Thank you.

Answer 1

I don't think its in PS docs. But with a bit of code inspecting you can see in

Backoffice/themes/default/template/helpers/form/form.tpl

            <input type="checkbox" name="{$id_checkbox}" id="{$id_checkbox}" class="{if isset($input.class)}{$input.class}{/if}"{if isset($value.val)} value="{$value.val|escape:'html':'UTF-8'}"{/if}{if isset($fields_value[$id_checkbox]) && $fields_value[$id_checkbox]} checked="checked"{/if} />
                                                {$value[$input.values.name]}

add the porperty 'val' to option.

        $options[] = array(
        'id_carrier' => $carrier['id_carrier'],
        'name' => $carrier['name'],
        'val' => $carrier['id_carrier'],
    );

Adn you get the desired serialization for the input values.

  "transportistas" => array:2 [▼
    0 => "73"
    1 => "78"
  ]