Hi there ! 

I am using Google App Engine for severals times now but I'm stuck about a 
querying issue. 

Here's my concern : 
I have two classes, lets say class A and class B. Class A have a referenced 
property on class B (classBproperty).
I have a collection of class B objects and I want to get all class A which 
referenced one of the class B contained in my classB collection. 

Here's what I managed to do : 

classBcollection = [...] # Collection of class B here

classB_keys = []
for obj in classBcollection:
    classB_keys.append(obj.key().id())

q = classA.all()
q.filter("classBproperty.__key__ IN ", classB_keys)

My point is that this returns an empty list even though in my datastore, I 
have several class A that referenced class B objects contained in my 
collection. 

It would be very nice if I can I have any help to figure out this ?

Thanks ! 

Ben

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