$(document).on('hidden.bs.modal', '#comment_modal', function(e, data, status, xhr) {
  $.ajax({
    type: "post",
    url: "comments/reload_comment_form"
    dataType: "html",
    success: function(e, data, response, xhr) {
      console.log('hidden sukces');
      $('#comment_form').html(e);
    }
  });
});