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  1. Qt
  2. QTBUG-43077

json null value is not stringified correctly from QVariantMap

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    • 4b63ab9a93, 3e5152be41

    Description

      Json "value:null" is converted to invalid QVariant when calling QJsonObject::toVariantMap(). When that variantmap is stringified in QML then null valued property is vanished. Can be reproduced by attached example.

      Expected output is:

      qml: {"x":null,"y":10}

      and output is:

      qml: {"y":10}

      Workaround is to replace invalid values with null QJsonValue:

          QString json = "{\"x\":null, \"y\": 10}";
    QJsonDocument jsonDoc = QJsonDocument::fromJson(json.toLatin1());
    QVariantMap map = jsonDoc.object().toVariantMap();

// WORKAROUND:
    foreach(QString k, map.keys()) {
        QVariant v = map.value(k);
        if(!v.isValid())
            map.insert(k,QJsonValue(QJsonValue::Null));
    }

      Attachments

        1. QTBUG-43077.zip
          3 kB
          Qt Support
        For Gerrit Dashboard: QTBUG-43077
        # Subject Branch Project Status CR V
        126187,4 QJsonValue::toVariant(): Differentiate between null and invalid dev qt/qtbase Status: MERGED +2 0

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            kandeler Christian Kandeler
            qtcomsupport Qt Support
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            Dates

              Created:
              Updated:
              Resolved:

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