Reformat data in cell

I tried reformat data in cell (QTableView) with my custom model. But I just get crash. This is my code what I use..

Code:

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QVariant customModel::data(const QModelIndex &index, int role) const
{
 
    if (role==Qt::DisplayRole && index.column()==3)
    {
        return index.model()->data(index, Qt::DisplayRole).toString().append("Rp. ");
    }
 
    return QSqlQueryModel::data(index, role);
}

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you call yourself (in the call to data): recursion, endless loop, stack overflow, crash...

call the base class's data() function instead.