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Type: Suggestion
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: 6.10.0 Beta2
Affects Version/s: None
Component/s: QML: Declarative and Javascript Engine
Labels:
- Reported_by_support_standard

Commits:
bbf2c0322 (dev), 4bd5b3127 (dev), f469d538a (dev), 3bc0a1140 (dev), 1cf72c90d (dev), 9ee136918 (dev), 495de8d46 (dev), 58f50363b (dev), ea39961f7 (dev), 8bc307e8e (dev), 335299d57 (6.10), 7873f3484 (dev), c5832c09c (dev)

Code
Adapted from https://doc.qt.io/qt-6/qtquick-modelviewsdata-modelview.html#changing-model-data

import QtQuick
import QtQuick.Controls.Basic
import MyApp

Window {
    width: 800
    height: 600
    visible: true

    ListView {
        anchors.fill: parent
        model: EditableModel {}
        delegate: TextField {
            required property var model
            required property string display

            width: ListView.view.width
            text: display
            Keys.onReturnPressed: model.edit = text
        }
    }
}

Shortcomings
The code above seems to be the "best" that can be done as of Qt 6.8.1. There are some unavoidable gaps:

1. Can't use strong typing

We must use the weakly-typed "required property var model". Changing it to "required property EditableModel model" causes "model.edit = text" to fail at runtime:

Main.qml:19: TypeError: Value is null and could not be converted to an object

2. QML tools can't understand the code

Warning: Main.qml:19:39: Could not compile binding for onReturnPressed: Type (component in Main.qml)::model with type QVariant does not have a property edit for writing [compiler]
            Keys.onReturnPressed: model.edit = text
                                               ^^^^

(Even if we can use required property EditableModel model, this problem persists)