DelegateChooser does not work

[Dmitriano]

What is wrong in QML code below?

import QtQuick.Controls 2.13
import Qt.labs.qmlmodels 1.0

//...

TableView {
          anchors.fill: parent
          columnSpacing: 1
          rowSpacing: 1
          clip: true

          model: TableModel {}

          delegate: DelegateChooser {
              role: "heading"
              DelegateChoice {
                  roleValue: true
                  delegate: Text {
                      text: tabledata
                  }
              }
              DelegateChoice {
                  roleValue: false
                  delegate: Text {
                      text: tabledata
                  }
              }
          }
      }

When I start the app I get the following errors in the application output:

TableView: failed loading index: 0
TableView: failed loading index: 21
TableView: failed loading index: 42
TableView: failed loading index: 63
TableView: failed loading index: 84
TableView: failed loading index: 105
TableView: failed loading index: 126
...

What does this mean?

There is the following delegate in the original example (that I cloned and modified):

delegate: Rectangle {
              implicitWidth: 150
              implicitHeight: 50
              border.color: "black"
              border.width: 2
              color: (heading==true)?"red":"green"

              TableView.onPooled: console.log(tabledata + " pooled")
              TableView.onReused: console.log(tabledata + " resused")

              Text {
                  text: tabledata
                  font.pointSize: 12
                  anchors.centerIn: parent
              }
          }

that works fine, but if I replace it with my DelegateChooser the app stops working.

My QT version is 5.13.

[ODБOï]

hi @dmitriano

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    TableView {
        anchors.fill: parent
        columnSpacing: 1
        rowSpacing: 1
        clip: true
        model: TableModel {}
        delegate: DelegateChooser {
            role: "type"
            DelegateChoice {        
             roleValue: "lab2"     
                delegate: Rectangle {
                    Text {
                        id: label2
                        text: "type delegate"
                    }
                }
            }
            DelegateChoice {
                // roleValue: "String" // default delegate
                delegate: Rectangle {
                     color: ms.containsMouse ? "#d2cc01" : "lightgrey"
                    MouseArea{
                        anchors.fill: parent
                        hoverEnabled: true
                        id:ms
                    }
                    implicitWidth: defaultLabel.implicitWidth + 8
                    implicitHeight: defaultLabel.implicitHeight + 4
                    Text {
                        id: defaultLabel
                        text: tabledata
                    }
                }
            }
        }
    }
}