QSortFilterProxyModel sub-class registration and instantiation issue.

SiN_Bizkit

Hi everyone!
I have a problem with instantiating of an QSortFilterProxyModel derived class instance directly in QML.
For e.g. I defined a class

class FilterModel: public QSortFilterProxyModel {
	Q_OBJECT
public:
	bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
};

Then I register the class:

static void registerQmlTypes()
{
	qmlRegisterType<FilterModel>("com.mycompany.app", 1, 0, "FilterModel");
}
Q_COREAPP_STARTUP_FUNCTION(registerQmlTy

And use it:

import QtQuick 2.12
import QtQuick.Controls 2.12
import com.mycompany.app 1.0 as App
ListView {
	model: App.FilterModel {
		sourceModel: App.someModel
	}
    delegate: Item { /** */ }
}

The problem is that it's sometimes can't load the qml file on process start and terminates. Error message:

Cannot assign object of type "App.FilterModel" to property of type "QAbstractItemModel*" as the former is neither the same as the latter nor a sub-class of it.

And this issue isn't persistent. Sometimes it occurs and sometimes not.
Anybody have any idea how can I fix it? I know that I can instantiate the model in C++ part and then pass to the QML, but I think it is an awkward solution.

SiN_Bizkit

Maybe it will help someone. This code fixed the issue:

#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
	qmlRegisterAnonymousType<QAbstractItemModel>(uri, 1);
#else
	qmlRegisterType<QAbstractItemModel>();
#endif