Wt

I have this code snippet for deleting from the database rows that are selected in a tableview/querymodel:

const Wt::WModelIndexSet selectedRows = tableView->selectedIndexes();
for (Wt::WModelIndexSet::iterator i = selectedRows.begin(); i != selectedRows.end(); ++i) {
    index = *i;
    queryModel->removeRow(index.row());
}

If the user highlights one or two rows, maybe around half a dozen (it's not the same every time, afaik) the code works OK.

However, if the user highlights too many rows - say, 20 - and presses the delete button, only some or none of the rows delete and the web session exits and reloads with this message:

[2014-May-20 18:18:33.355890] 856 [/ JmvMBN3UNZ0adB0N] [error] "Wt: error during event handling: QueryModel: geometry inconsistent with database"
[2014-May-20 18:18:33.366892] 856 [/ JmvMBN3UNZ0adB0N] [error] "Wt: fatal error: QueryModel: geometry inconsistent with database"
Web client has been de-registered
127.0.0.1 - - [2014-May-20 18:18:33.377893] "POST /?wtd=JmvMBN3UNZ0adB0N HTTP/1.1" 200 151WEB SESSION ENDED
Warning: Wt::Dbo::Session exiting with 14[2014-May-20 18:18:33.388894] 856 - [info] "WebRequest: took 183.019ms" dirty objects
[2014-May-20 18:18:33.455900] 856 [/ JmvMBN3UNZ0adB0N] [info] "Wt: session destroyed (#sessions = 2)"

What am I doing wrong?

thanks

John