@Pl45m4 said in How to add a row to a subclass of QAbstractTableModel?: For more detail check out the Editable TreeView Example (it's TreeView but in general the insert/remove procedure of rows and cols is the same) https://doc.qt.io/qt-6/qtwidgets-itemviews-editabletreemodel-example.html @jdent see here

Without going into whether this is appropriate use or not, an easy solution is to store the data using a role that the delegate won't render. Eg: QAbstractItemModel *model = tableWidget.model(); QModelIndex index = tableWidget.currentIndex().; QVariant data = getData(); model->setData(index, data, ItemDataRole::UserRole)

Thanks you all. I'll try to do it.

Just found out about QSortFilterProxyModel::filterAcceptsColumn which provides an integer for the column-index and hence suits my usecase perfectly. Still unsure why I couldn't get it to work with map(From/To)Source though

@mrjj Thanks I got it to work. ui->setupUi(this); ui->tableWidget->setColumnCount(2); ui->tableWidget->setRowCount(numberSet.size()); ui->tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers); QStringList tableHeader = {"Number", "Result"}; ui->tableWidget->setHorizontalHeaderLabels(tableHeader); int rowCounter = 0; for(int i : numberSet) { ui->tableWidget->setItem(rowCounter, 0, new QTableWidgetItem(QString::number(i))); ui->tableWidget->setItem(rowCounter, 1, new QTableWidgetItem(someConversion(i))); rowCounter++; }