from PySide2 import QtCore, QtQml, QtGui, QtQuick


class MyObject(QtCore.QObject):
    def __init__(self, name, parent=None):
        super().__init__(parent)
        self._name = name

    def getName(self):
        return self._name

    name = QtCore.Property(str, getName)


class AbstractListModel(QtCore.QAbstractListModel):

    def __init__(self, data, parent=None):
        super().__init__(parent)
        self._data = data

    def roleNames(self):
        return {QtCore.Qt.UserRole + 1: b'name'}

    def rowCount(self, index):
        return len(self._data)

    def data(self, index, role):
        if not index.isValid():
            return None
        attr = self.roleNames()[role].decode('utf-8')
        elem = self._data[index.row()]
        return getattr(elem, attr)


class ConcreteModel(AbstractListModel):

    def __init__(self, parent=None):
        data = [MyObject('1'), MyObject('2')]
        super().__init__(data, parent)


class ConcreteModelWorking(QtCore.QAbstractListModel):

    def __init__(self, parent=None):
        super().__init__(parent)
        self._data = [MyObject('1'), MyObject('2')]

    def roleNames(self):
        return {QtCore.Qt.UserRole + 1: b'name'}

    def rowCount(self, index):
        return len(self._data)

    def data(self, index, role):
        if not index.isValid():
            return None
        attr = self.roleNames()[role].decode('utf-8')
        elem = self._data[index.row()]
        return getattr(elem, attr)


def main():
    app = QtGui.QGuiApplication([])
    QtQml.qmlRegisterType(MyObject, 'Test.Lib', 1, 0, 'MyObject')
    QtQml.qmlRegisterType(ConcreteModel, 'Test.Lib', 1, 0, 'ConcreteModel')
    view = QtQuick.QQuickView()
    view.setSource(QtCore.QUrl('bug.qml'))
    view.show()
    app.exec_()


if __name__ == '__main__':
    main()