Re: import error and deleting an object from the ZODB

aschmitz <[email protected]> writes:

> ... so I exported each one to its own ZEXP file.
>
> I'm getting an error on two of the sites, when I try to import them:
>
>     Error Type: ImportError
>     Error Value: No module named CacheSetup.content.caching_policy_manager

> ...
> Based on the export I think the ID of the problem object is 1648800.

With "ID" you hopefully mean "ZODB object id" - even though, this
looks strange as ZODB object ids usually are represented as hexadecimal
values (beeing 8 byte binary numbers).

> Can I
> use this information to delete this object from the ZODB, so the export will
> be importable again?

The ZODB does not have a function to delete selected objects -- as
this presents the danger of "dangling references". Instead, you
modify other objects that "point to" the object to be deletd and remove
there the reference to the object.
Then "packing" will eventually delete the object once it is no longer
referenced.
Thus, the answer is "no".

You will find in the export also the objects referencing the
problematic object. Those you can load from the ZODB via
code like the following, modify them (no longer to reference the object)
and commit. This will allow you to clean up - if Kim's advice does
not give you an easier way:

    # in "bin/{instance|client1} debug"
    from ZODB.utils import p64
    obj = app._p_jar[p64(oid)] # load object with oid "oid"


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