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Just checking how Durus behaves under "hostile" usage, I got this
(previsible) effect. Probably already known:

>>> from durus.persistent_dict import PersistentDict
>>> w=PersistentDict()
>>> root[0]=w
>>> connection.commit()
>>> del root[0]
>>> connection.commit()
.... Now we do a packing in other session ...
>>> root[0]=w
>>> connection.commit()

Now "root" has a dangling point to an inexistent object:

(opening a new session)
>>> root[0]

>>> root[0].items()
Traceback (most recent call last):
  File "", line 1, in ?
  File "/tmp/z/Durus-3.1/build/lib.linux-i686-2.4/durus/persistent.py",
line 124, in _p_load_state
    self._p_connection.load_state(self)
  File "/tmp/z/Durus-3.1/build/lib.linux-i686-2.4/durus/connection.py",
line 151, in load_state
    raise ReadConflictError([oid])
ReadConflictError: oids=[1]

I suggest to add to docs that we shouldn't keep references to objects
between transactions. We must refetch (perhaps from Durus internal
cache) objects when we start a new transaction.

Probably known already, sorry to bother you, but I didn't find any
reference in current docs.

I was checking this out in order to validate my design for the
BerkeleyDB backend, since it could erase the object without needing the
pack, so the effect would be far more severe.

- --
Jesus Cea Avion                         _/_/      _/_/_/        _/_/_/
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