[Zope3-Users] updating objects in ZODB

[Stephan Richter]

On Friday 10 February 2006 05:15, Lorenzo Gil Sanchez wrote:
> Any pointer to documentation about this or to an example application
> that does this will be very helpful.

Here is a generations script (snippet) I wrote for SchoolTool:

def fixPermissionMap(obj):
    if isinstance(obj, PersistentSecurityMap):
        for pkey, data in obj._byrow.items():
            if pkey.startswith('schoolbell'):
                obj._byrow['schooltool' + pkey[10:]] = data
                del obj._byrow[pkey]

        for key, data in obj._bycol.items():
            for pkey, pdata in data.items():
                if pkey.startswith('schoolbell'):
                    obj._bycol[key]['schooltool' + pkey[10:]] = pdata
                    del obj._bycol[key][pkey]


def evolve(context):
    storage = context.connection._storage
    next_oid = None
    # Note: Loop through all persistent, active objects.
    while True:
        oid, tid, data, next_oid = storage.record_iternext(next_oid)
        obj = context.connection.get(oid)
        # Make sure that we tell all objects that they have been changed. Who
        # cares whether it is true! :-)
        # Note: Only needed if you want to only update class references
        obj._p_activate()
        obj._p_changed = True

        # Now fix up other things
        fixAnnotations(obj)
        fixCalendar(obj)
        fixTimetables(obj)
        fixOverlaidCalendars(obj)
        fixPermissionMap(obj)

        if next_oid is None:
            break

Regards,
Stephan
-- 
Stephan Richter
CBU Physics & Chemistry (B.S.) / Tufts Physics (Ph.D. student)
Web2k - Web Software Design, Development and Training