Nette\Database\Table\Selection::rewind PHP Method

    public function rewind()
    {
        $this->execute();
        $this->keys = array_keys($this->data);
        reset($this->keys);
    }

 public function render()
 {
     $this->_calendarMonthData->rewind();
     $this->template->data = $this->_calendarMonthData;
     $this->template->setFile(__DIR__ . '/Month.latte');
     $this->template->render();
 }