/**
  * Save the form.
  *
  * @param FormBuilder $builder
  * @return bool|mixed
  */
 public function save(FormBuilder $builder)
 {
     $form = $builder->getForm();
     $namespace = $form->getEntry() . '::';
     /* @var FieldType $field */
     foreach ($form->getFields() as $field) {
         $this->preferences->set($namespace . $field->getField(), $form->getValue($field->getInputName()));
     }
 }