[PyQt] pyqtSlot, getting "undefined" return values when called from qml javascript

[Ville M. Vainio]

I have a qml file invoking methods on a QObject subclass. I have used
@pyqtSlot decorator to expose the methods as slots.

I can see that the methods are run; however, the return values seem to
be discarded.

Code for the QObject subclass (that I expose with setContextProperty)
is like this:

===
from PyQt4 import QtCore
from PyQt4.QtCore import QObject,pyqtSlot

class NodeWrapper(QObject):
    def __init__(self, c,v):
        QObject.__init__(self)

        self.c = c
        self.v = v

    @pyqtSlot()
    def get_b(self):
        return 2
        #return self.v.b
    @pyqtSlot()
    def get_h(self):
        return self.v.h
    @pyqtSlot()
    def children(self):
        #self.all = all = [NodeWrapper(self.c, chi) for chi in self.v.children]
        all = "hello"
        print "Will ret",all
        return all

===

I have tried passing return value in the decorator (return=int...).

Any clues where to look?

pyqt version is 4.9.1-2ubuntu1, on Ubuntu precise pangolin.