QCompleter & QTreeview get crash on MacOS and Qt 5.12.2

Gulivert

Greetings to all,

For a QLineEdit I tried to create an auto-completer from a list requested on an API server. I'm able to have the correct behavior but some time when the dialog window is opening the whole application crash. If I remove the whole code to create the QCompleter I do not have this crash.
It seems I did something not correctly but as I'm new with Qt I cannot figure out what is wrong and why sometime the dialog works as expected and sometime the app just crash.

Here is how I create and bind my QCompleter to QLineEdit, maybe you will see something wrong...

void CreateAppointmentDialog::patientsFetched(QJsonArray patients)
{
    // Create an auto completer
    QCompleter *completer = new QCompleter(this);
    completer->setCompletionMode(QCompleter::PopupCompletion);
    completer->setCaseSensitivity(Qt::CaseInsensitive);
    completer->setMaxVisibleItems(10); // No effect ?
    completer->setFilterMode(Qt::MatchContains);


    // Create a new model to list patients
    QStandardItemModel *patientsModel = new QStandardItemModel(patients.count(), 3, completer);

    int counter = 0;
    foreach (const QJsonValue &value, patients) {
        QJsonObject patientObj = value.toObject();

        QModelIndex patientNameIdx = patientsModel->index(counter, 0);
        QModelIndex patientBirthdateIdx = patientsModel->index(counter, 1);
        QModelIndex patientIdIdx = patientsModel->index(counter, 2);
        QString patientName = patientObj["lastname"].toString() + " " +  patientObj["firstname"].toString();
        QString patientBirthdate = patientObj["birthdate"].toString() != "" ? QDate::fromString(patientObj["birthdate"].toString(), Qt::ISODate).toString("dd.MM.yyyy") : "";
        QString patientId = patientObj["id"].toString();
        patientsModel->setData(patientNameIdx, patientName);
        patientsModel->setData(patientBirthdateIdx, patientBirthdate);
        patientsModel->setData(patientIdIdx, patientId);

        counter++;
    }

    completer->setModel(patientsModel);

    QTreeView *treeView = new QTreeView;
    completer->setPopup(treeView);
    treeView->setRootIsDecorated(false);
    treeView->hideColumn(2);
    treeView->header()->hide();
    treeView->header()->setStretchLastSection(false);
    treeView->header()->setSectionResizeMode(0, QHeaderView::Stretch);
    treeView->header()->setSectionResizeMode(1, QHeaderView::ResizeToContents);

    ui->patientsEdit->setCompleter(completer);

    connect(treeView, &QTreeView::clicked, [=]{
        selectedPatientId = treeView->currentIndex().sibling(treeView->currentIndex().row(),2).data().toString();
    });
}

Any help will be really appreciate.

Regards,

Gulivert

After investigating it seems that QCompleter is not my problem.
Then I think I need to learn how to debug my app to understand from where this crash is coming.

mrjj

Hi
The first start is just to start the app in debug mode (f5) and get it to crash.
That will show a list of called methods until it crashed.
That often gives a good clue to what is happening.

alt text

Gulivert

Thank's for your advise!
I finally figured out what was wrong and the problem was coming from the customContextMenu where I specified a bad table to popup the menu from QModelIndex in the parent where I called the dialog CreateAppointmentDialog.

Sorry I was sure that it was first coming from the combo of QCompleter & QTreeview.