Sorting TableView column in qml

Question

I need to sort my column number 1 in TableView. I followed this link but I get some errors and I'm not really sure why it doesnt work.

In my TableView model qml file I have this:

TableView
{
    ...
    onSortIndicatorColumnChanged: model.sort(1, sortIndicatorOrder)
...

and in cpp file:

    Q_INVOKABLE virtual void sort(int column, Qt::SortOrder order=Qt::AscendingOrder)
    {
        proxyModel=new QSortFilterProxyModel;
        qDebug("Sorting by column %d", column);
        proxyModel->sort(column, order);
    }