[ZODB-Dev] Help! BTrees and hashing on Persistent objects not working

[JohnD.Heintz]

The following code raises an AssertionError because the BTree doesn't use=
 the=20
Python defined __hash__ methods.

Should I log this as a Collector bug or am I doing something wrong?

John


import ZODB
from BTrees.OOBTree import OOBTree
from ZODB import Persistence

class HashablePersistent(Persistence.Persistent):
    """
    """
    def __init__(self):
        self.__version =3D "1.0"
        self.hashCalled =3D 0

    def __hash__(self):
        """
        Trivial __hash__ implementation to get identity
        """
        self.hashCalled =3D 1
        return 5

    def __cmp__(self, other):
        return 0 # I know this needs to be implemented

p =3D HashablePersistent()
dict =3D {}
dict[p] =3D p
assert p.hashCalled

p =3D HashablePersistent()
btree =3D OOBTree()
btree[p] =3D p
assert p.hashCalled # !!This fails!!

--=20
=2E . . . . . . . . . . . . . . . . . . . . . . .

John D. Heintz | Senior Engineer

1016 La Posada Dr. | Suite 240 | Austin TX 78752
T 512.633.1198 | jheintz@isogen.com

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