QList<QObject*> model question

Verhoher

Hello, I'm trying to build an leader-board model that would be filled with Object List, the code looks like:

void UserHandler::handleLeaderboard()
{
    qDebug() << "In UserHandler.handleLeaderboard";
    QList<QObject*> leaderList;

    if (l_db.open())
    {
        qDebug() << "DB connection opened.";
        QSqlQuery leaderFetch;
        //Fetch data to be filled in  leaderboardData model
        QString leader_query = QString("SELECT rowus.place ,us.login,us.Points from users us,(SELECT ROW_NUMBER() OVER (ORDER BY points desc) AS place FROM users) rowus where rowus.Place < 101 order by Points desc, login asc;");
        qDebug() << "Querry "<< leader_query;
        if (leaderFetch.exec(leader_query))
        {
            while (leaderFetch.next()) {

                leaderList.append(new LeaderboardData(leaderFetch.value(0).toInt(), leaderFetch.value(1).toString(),leaderFetch.value(2).toInt()));
                 qDebug() << "Querry  got user: "<<leaderFetch.value(1).toString();
            }
            l_db.close();
        }
        else
        {
            qDebug() << "Error happened - " << l_db.lastError().text();
            qDebug() << "Closing connection";
            l_db.close();
            gotError("Ooops, there seems to be a problem");
        }
    }
    QQuickView view;
    view.setResizeMode(QQuickView::SizeRootObjectToView);
    QQmlContext *ctxt = view.rootContext();
    ctxt->setContextProperty("leaderboardModel", QVariant::fromValue(leaderList));
}

and I call it in QML as

        TableView {
            id:tblLeaders
            anchors.fill: parent
            TableViewColumn {
                id: colView
                role: "place"
                title: "Place"
                width: 36
            }
            TableViewColumn {
                id: colLogin
                role: "login"
                title: "Username"
                width: parent.width - colView.width - colPoints.width
            }
            TableViewColumn {
                id: colPoints
                role: "points"
                title: "Points"
                width: 128
            }
            model: leaderboardModel
        }

But When the view gets rendered I get:

qrc:/Leaderboards.qml:56: ReferenceError: leaderboardModel is not defined

Where and how i should define the context for this model for it to be accessible in QML?

raven-worx

make sure setContextProperty() call happens before you set the QML file.
Is this the case?

Verhoher

@raven-worx Oh, this might be the case. I have a TabView (that is not visible until the handleLeaderboard logic is executed) storing the Leaderboards.qml. But I guess Leaderboards.qml was set on declaring it with

visible:false

and the error was shown only on switching to the tab containing the QML. Is it so?

Also what could I use to not set the QML file until a custom specific signal is emitted?

raven-worx

@Verhoher said:

Also what could I use to not set the QML file until a custom specific signal is emitted?

alternatively you could initially add a QObject* as context property. and let this object manage the list retrieval. Then from the object you can trigger a signal and react on it in QML for example.

Verhoher

@raven-worx Thanks, will try that.