Using multiselect checkbox in 1.6 ('type' => 'select', works)

[FAS]

I am adding an additonal field to the customer personal information making use of multi select checkboxes for the user to make his selection. I have it working in the front end, after a bit if a struggle!, but can't get the back office customer form to fully work.

I can collect the the users selection and add it to the database, but I cannot figure out how to populate the customer form with exisiting values when updating, although it works fine with the type = select.

The code in AdminCustomersController.php looks like this:

    public function renderForm()
    {...........

        $this->fields_value['angling_preference[]'] = explode(',',$obj->angling_preference); // Populates the field

        $this->fields_form = array(..........

              // Checkbox doesn't populate with selection from the database

              array(
                    'type' => 'checkbox',
                    'name' => 'angling_preference[]',
                    'label' => $this->l('Type of Angling Preferred (Angling Type):'),
                    'class' => 'chosen',
                    'multiple' => true,
                    'required' => true,
                    'values' => array(
                        'query' => $list_angling_preferred,
                        'id' => 'id',
                        'name' => 'label'
                    )
                ),

              // Select works fine with selection from the database

               array(
                    'type' => 'select',
                    'label' => $this->l('Type of Angling Preferred (Angling Type):'),
                    'name' => 'angling_preference[]',
                    'class' => 'chosen',
                    'multiple' => true,
                    'size' => '6',
                    'required' => true,
                    'options' => array(
                        'query' => $list_angling_preferred,
                        'id' => 'id',
                        'name' => 'label',
                        'selected' =>'selected'
                    )
                ),

The input checkbox works and I can collect the information that is selected and save it to the database, but I can't figure out how to populate it with the previously entered values added from the database.

The input select works fine and populates with data from the database and does everything I need, but it ain't what I want!!!!!

One other small thing, with the input select option the Size = 6 option doesn't work, am I making a syntatical error or if this not supported in Prestashop 1.6?

Many thanks for your help.

[elementChaosu]

In 1.6, for multiple checkboxes in adminController, let's say I have this in renderForm()

    $this->fields_form['input'][] = [
                        'type' => 'checkbox',
                        'name' => 'buttons[]',
                        'label' => $this->l('Checkboxes'),
                        'class' => 'chosen',
                        'multiple' => true,
                        'required' => true,
                        'values' => array(
                            'query' => $buttons,
                            'id' => 'id_button',
                            'name' => 'name'
                        ),
    ];

According to this line in adminer/themes/default/template/helpers/form/form.tpl

    <input type="checkbox"
        name="{$id_checkbox}"
        id="{$id_checkbox}"
        ...
        {if isset($fields_value[$id_checkbox]) && $fields_value[$id_checkbox]} checked="checked"{/if} />

  I'd have to send stored values from db in $checkboxes into Helper->fields_value, in my case like this:

         foreach ($checkboxes as $cb) {
            $this->fields_value['buttons[]_'.$cb] = true;
         }

voilá,  checkboxes are checked