Oh, I also realize you are meaning to set the 'a' property on B,
which is usually good modelling practice. So, you need to do:
b = B(parent=a, a=a)
On Oct 24, 4:16 am, log1 <[email protected]> wrote:
> Hello,
>
> This is my problem:
>
> class A(db.Model):
> up = db.IntegerProperty(default=0, required=True)
> down = db.IntegerProperty(default=0, required=True)
>
> def move(self, direction):
> a = A.get(self.key())
>
> def txn(a, direction):
> if direction == "up":
> a.up += 1
> else:
> a.down += 1
> a.put() # OK
> b = B(a=a)
> b.put() # Cannot operate on different entity groups in a
> transaction???
>
> db.run_in_transaction(txn, a, direction)
>
> class B(db.Model):
> a = db.ReferenceProperty(A, collection_name='a_b')
>
> Can somebody tell me what I'm doing wrong?
> Thanks
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