        'priority': event.to.id,
                'positions': JSON.stringify(positions)
              },
              success: function (data) {
                console.log(data)
              }
            });

            {% comment %} An "empty" group will have one row, the placeholder row {% endcomment %}
            if (event.to.rows.length > 0) {
              if (placeholder !== undefined) {
                placeholder.parentNode.parentNode.deleteRow(placeholder.rowIndex)
              }

          