Devise\Pages\Fields\LiveFieldValue::extract PHP Method

    public function extract()
    {
        foreach ($this->__->values as $key => $value) {
            $this->{$key} = $value;
        }
    }

 public function test_it_extracts()
 {
     $obj = new LiveFieldValue('{}', 12, 'field');
     $obj->extract();
 }