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Details

Type: Bug
Resolution: Unresolved
Priority: P1: Critical
Fix Version/s: 6.8
Affects Version/s: 6.8.0
Component/s: QML: Declarative and Javascript Engine
Labels:
- reported_by_support_standard

Platform/s:

All

Description

The array (QVariantList) returned from C++ to QML is not reflecting the changes made in QML/JS when we attempt to assign a new value to an item.

We have an array of objects returned from C++, and when we assign a new value to an item in that array, the item's value does not update at all, remaining as the original value instead.

C++:

QVariantList Contacts::getContacts() const {
    return QVariantList {
        QVariantMap { {"name", "Alice Smith"}, {"email", "alice@example.com"}, {"phone", "123-456-7890"} },
        QVariantMap { {"name", "Bob Johnson"}, {"email", "bob@example.com"}, {"phone", "987-654-3210"} },
        QVariantMap { {"name", "Charlie Brown"}, {"email", "charlie@example.com"}, {"phone", "555-555-5555"} }
    };
}

QML:

Window {
    width: 640; height: 480
    visible: true
    Contacts { id: contactsModel }
    Component.onCompleted:{
        const items = contactsModel.getContacts()
        console.log("Original List", JSON.stringify(items))
        console.log("Before item 1 modified", JSON.stringify(items[0]))

        items[0].email = "This Email Should Mutate"

        console.log("After item 1 modified", JSON.stringify(items[0]))
    }
}

Output log:

Original List [{"email":"alice@example.com","name":"Alice Smith","phone":"123-456-7890"},{"email":"bob@example.com","name":"Bob Johnson","phone":"987-654-3210"},{"email":"charlie@example.com","name":"Charlie Brown","phone":"555-555-5555"}]
Before item 1 modified {"email":"alice@example.com","name":"Alice Smith","phone":"123-456-7890"}
After item 1 modified {"email":"alice@example.com","name":"Alice Smith","phone":"123-456-7890"}