QSqlTableModel - how to change row headers?

Mnemonic

Hello,

I'd like to change row headers in QSqlTableModel, in case of QStandardItemModel this line works fine:

model->setHeaderData(model->rowCount() - 1, Qt::Vertical, value);

But for QSql nothing happens. How to solve it? How to design solution in case of necessary omit an issue? I'm using OnFieldChange strategy and Qt 5.12.

JonB

@Mnemonic

Verify what model->rowCount() is at the time you call it --- might not be what you expect.
Try model->setHeaderData(0, Qt::Horizontal, "Test"); to verify that works. Is the issue then with Qt::Vertical only?
Try sub-classing and overriding QVariant QSqlTableModel::headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const, does that work? (Maybe have a look at old post at https://www.qtcentre.org/threads/15328-setHeaderData-Qt-Vertical-on-QSqlTableModel .)

I suspect (not sure) the issue is that setHeaderData(Qt::Vertical) has somewhere to store your value in a QStandardItemModel but not in a QSqlTableModel. The last suggestion may address that.

Mnemonic

Calling method with constant values doesn't help. I read that method is not working in general for QSqlTableModel.
I have tried to override method which you mentioned. Indeed it works, but it returns separately all row headers every time when I insert new record to the model. I present working day number and currently calculation this require using class private variable. I cannot do this with const at the end of method. Maybe I should try to implement my logic in another way... but is there any chance of getting another simpler idea? I'm not professional c++ programmer, so I'll be grateful for help. Thanks.

Edit: It seems that no one have other ideas, In the meantime I reimplemented calculating method for filing row headers data.
Thank you JonB for help!