How to set value to model property in Qt Quick QComboBox in c++ during run-time

Thilak

I want to populate the list of Dropdown box (QComboBox) from the Http response during run-time. Most of the internet resources suggests to use setInitialProperties() method in main() method.

This is my attempt: I have created my own model by sub-classing QAbstractListModel and I believe I've implemented all the required methods correctly. And then I set the model to the QComboBox QObject using setProperty() method.

class DataObject
{
private:
    QString m_text, m_value;
public:
    DataObject(QString text, QString value);
    const QString& getText() const;
    const QString& getValue() const;
};

class DataObjectModel : public QAbstractListModel
{
    Q_OBJECT
public:
    explicit DataObjectModel(QObject *parent = nullptr);
    // Basic functionality:
    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
    QHash<int, QByteArray> roleNames() const;
    enum DataObjectRoles {
        TextRole = Qt::UserRole + 1,
        ValueRole
    };
    Q_INVOKABLE void push(const QString &text, const QString &value);
    Q_INVOKABLE void print();
private:
    QList<DataObject> m_dataObjects;
};

During run-time, a slot is invoked after Http response is received and data is parsed and added to User-defined model. Then I'm trying to set that user-defined model to QComboBox like this :

DataObjectModel model;
foreach(...){
        ...
        model.push(text,value);
}
QObject* snapshotsDropdown = screen01RootQObject->findChild<QObject*>("snapshotDropdown",Qt::FindChildrenRecursively);
if(snapshotsDropdown != nullptr){
        snapshotsDropdown->setProperty("model", QVariant::fromValue(&model));
}

Problem : But the QComboBox shows empty list to select from. The drop-down list is not updated.