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Details

Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: 6.7.1, 6.7, 6.8.0 FF
Affects Version/s: 6.7.0
Component/s: QML: Declarative and Javascript Engine
Labels:
None

Platform/s:

Linux/X11, Windows
Commits:
152e6716b (dev), f1e3b4f2a (6.7)

Description

A QVariantList returned from Cpp to QML could be used just like a regular QML Javascript array, for example:

you could use it to call a Cpp function taking a QJsonArray argument
you could put it in a Javascript object and call a Cpp function taking a QJsonObject argument

Both does not work anymore with Qt 6.7.0, see the following example.

cpp

QVariantList MiscUtils::createVariantList() const {
    return {QString("cpp"), QString("variant"), QString("list")};
}

void MiscUtils::logArray(const QJsonArray& arr) const {
    const auto str = QJsonDocument(arr).toJson(QJsonDocument::Compact);
    std::cout << "Cpp QJsonArray: " << str.toStdString() << "\n";
}

void MiscUtils::logObject(const QJsonObject& obj) const {
    const auto str = QJsonDocument(obj).toJson(QJsonDocument::Compact);
    std::cout << "Cpp QJsonObject: " << str.toStdString() << "\n";
}

qml

const varlist = MiscUtils.createVariantList();
console.log("QML varlist:", JSON.stringify(varlist));
const obj = { test: varlist };
console.log("QML object:", JSON.stringify(obj));
MiscUtils.logArray(varlist);
MiscUtils.logObject(obj);

Output Qt 6.6

QML varlist: ["cpp","variant","list"]
QML object: {"test":["cpp","variant","list"]}
Cpp QJsonArray: ["cpp","variant","list"]
Cpp QJsonObject: {"test":["cpp","variant","list"]}

Output Qt 6.7.0

QML varlist: ["cpp","variant","list"]
QML object: {"test":["cpp","variant","list"]}
Cpp QJsonArray: []
Cpp QJsonObject: {"test":{"0":"cpp","1":"variant","2":"list"}}