Update data

    function UpdateParticipant(){
      request = jQuery.ajax({
        url: "/participants/UpdateParticipant",
        method: 'post',
        data: { waiting_for_user_id : id , game_data : boardParts },
        dataType: "json"
      });

      request.done(function( msg ) {
        console.log(msg);
      });

      request.fail(function( jqXHR, textStatus ) {
        alert( "Request failed: " + textStatus );
      });
   }