ASSERT: "first <= rowCount(parent)" in file itemmodels\qabstractitemmodel.cpp with TableView QC1

chilarai

Hi all,

I have the following TableView in QML and implemented a normal QSqlQueryModel as the data model. The model in itself runs without error. But, at times when I run it in my TableView, I get ASSERT: "first <= rowCount(parent)" in file itemmodels\qabstractitemmodel.cpp. I did not find any relevant documentation to rectify the same. What could be wrong with the TableView or if somebody can point me to the right documentation?

import QtQuick 2.3
import QtQuick.Window 2.2
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.2


Rectangle {
    id: win
    width: parent.width
    height: parent.height
    visible: true

    Connections{
        target: QueryModel

        function onHeaderDataChanged(tableHeaders){
            setHeaders(tableHeaders)
        }
    }

    function setHeaders(tableHeaders){
        if(tableHeaders.length > 0){
            roleNames = tableHeaders

            for(var i=0; i<roleNames.length; i++){
                var role  = roleNames[i]
                var columnString = 'import QtQuick 2.3; import QtQuick.Controls 1.2; TableViewColumn {role: "' + role + '"; title: "' + role + '"; }';
                newObject[i] = Qt.createQmlObject(columnString, view)
                view.addColumn(newObject[i])
            }
        }
    }

    function clearTable(){
        for(var i=0; i<roleNames.length; i++){
            view.removeColumn(newObject[i])
            delete newObject[i]

        }
    }


    TableView {
        id:view
        width: parent.width
        height: parent.height
        alternatingRowColors: false
        visible: false
        model: QueryModel

        style: TableViewStyle {
            headerDelegate: Rectangle {
                height: textItem.implicitHeight * 1.8
                width: textItem.implicitWidth
                color: Constants.themeColor

                Text {
                    id: textItem
                    anchors.fill: parent
                    verticalAlignment: Text.AlignVCenter
                    horizontalAlignment: styleData.textAlignment
                    anchors.leftMargin: 12
                    text: styleData.value
                    elide: Text.ElideRight
                    color: textColor
                    font.bold: true
                    renderType: Text.NativeRendering


                }
            }

            itemDelegate: Rectangle {
                color: "white"


                Text {
                    id: textItem1
                    anchors.fill: parent
                    verticalAlignment: Text.AlignVCenter
                    text: QueryModel.data(QueryModel.index(styleData.row, styleData.column))
                    horizontalAlignment: styleData.textAlignment
                    anchors.leftMargin: 12
                    elide: Text.ElideRight
                    color: textColor
                    renderType: Text.NativeRendering

                }
            }
        }
    }
}

VRonin

Looks like a problem with QueryModel. Can you post the code of that class?

chilarai

Thanks @VRonin. You are right. I tried to change the behavior of rowCount() method which was not behaving properly on Qml TableView.

I have fixed it now.

pchoppa

@chilarai - Could you please let me know what exactly you did to get rid of this assertion?

I'm having a similar problem with my tree view and struggling for two days. ANy help is greatly appreciated. Thank you!