function buildForm()
{
$form = new LaraForm($this->relation);
$form->putTbHidden('relation')->setValue($this->relation);
$options = [];
$model = $this->traitEntityBelongsToMany_getBelongsModel();
if ($model) {
$options = $model::orderBy($this->orderByModel())->listsExt();
if (!is_array($options)) {
$options = [];
}
}
$form->putTbGroupCheckbox('belongs_to_many', $options, false);
$ids = $this->ids();
$form->initValues(['belongs_to_many' => array_combine($ids, $ids)]);
if ($form->validate()) {
$many = $form->getFieldValue('belongs_to_many');
$filtered = array_filter($many, function ($value) {
return $value;
});
$ids = array_keys($filtered);
$this->model->{$this->relation}()->sync($ids);
}
$this->traitEntityBelongsToMany_form = $form;
}
