QML Connections, Cannot assign to non-existent property "onIgnoreUnknownSignalsChanged"

[SPlatten]

I'm getting this message:

PlantInputs.qml:149:21: QML Connections: Cannot assign to non-existent property "onIgnoreChanged"

Line 149 is the Connections:

Connections {
   target: model
   onIgnoreChanged: {
       if ( typeof ignoreState == "object" ) {
           console.log("modelIgnore: " + (typeof modelIgnore));
           ignoreState.switchState = modelIgnore ? constants.off : constants.on;
      }
  }
}

I've searched around online for help and found:
https://doc.qt.io/qt-5/qtqml-syntax-signals.html

target would appear to be assigned the id of the item that has the property "Ignore", I cannot see any item with the id "model" in the QML file. Would this explain the error?

[SPlatten]

I've fixed this now by writing functions that check the C++ function returns:

            model: {
                var machineSensorListModel;

                if ( typeof ioSensorModel === "object" ) {
                    var fn = ioSensorModel.getMachineSensorListModel;

                    if ( typeof fn === "function" ) {
                        machineSensorListModel = fn(constants.machineInputType);
                    }
                }
                return machineSensorListModel;
            }

I no longer get the messages.

[sierdzio]

model has to come from somewhere. It can be a property of one of your items (like ListView, Repeater, GridView, ComboBox etc.), or an object set as context property on QML engine (in your C++ code). Hard to say anything more without more data.

Purely guessing based on names, I'd say the slot name should rather be onIgnoreStateChanged. But it's only a guess.

Use Ctrl+Shift+F (in Qt Creator) to look for:

• "model"
• model:
• ignoreChanged(
• ignoreStateChanged(

One of these should yield some results.

[SPlatten]

@sierdzio , thank you, this is from the original Qt 4.8 project which as far as I'm aware was working, although I cannot say for certain:

From the QML:

                RoundedSwitch {
                    id: ignoreState
                    onTextColor: "white"
                    offTextColor: "grey"
                    offSwitchBackgroundColor: "white"
                    fillColor: Utils.buttonGradientLightColor()
                    switchState: model.ignore
                    anchors.verticalCenter: parent.verticalCenter
                    anchors.right: parent.right
                    anchors.rightMargin: 35

                    onButtonPushed: {
                        //if switchstate = off, ignore
                        ioSensorModel.setIgnoreValue(model.id, switchState == constants.off)
                    }
                    Component.onCompleted: {
                        ignoreState.switchState = model.ignore ? constants.off : constants.on;
                    }
                    Connections {
                        target:model
                        onIgnoreChanged: {
                            ignoreState.switchState = model.ignore ? constants.off : constants.on
                        }
                    }
                }

model I'm assuming is the model in the parent ListView container which is set as follows:

ListView {
            id: inputListView
            anchors.fill: parent
            model:ioSensorModel.getMachineSensorListModel(constants.machineInputType)

[SPlatten]

I've fixed this now by writing functions that check the C++ function returns:

            model: {
                var machineSensorListModel;

                if ( typeof ioSensorModel === "object" ) {
                    var fn = ioSensorModel.getMachineSensorListModel;

                    if ( typeof fn === "function" ) {
                        machineSensorListModel = fn(constants.machineInputType);
                    }
                }
                return machineSensorListModel;
            }

I no longer get the messages.