Piotr Chamera wrote at 2006-12-6 00:57 +0100:
>I am using Zope 2.9 (zodb 3.6, FileStorage). The object I am interested
>has several updates. Is there any way to get its previous states ("dead"
>versions) to "live" objects (I need current state and all past states so
>I cant? simply undo changes).
Yes -- But it might be a bit difficult when the object has
persistent subobjects.
The following code has chances to work (I used it for ZODB 3.2;
not sure whether it needs some modifications for ZODB 3.6).
# $Id: History.py,v 1.3 2006/11/29 12:54:00 dieter Exp $
'''Support for access to the history of objects.'''
from OFS.History import historicalRevision
from Acquisition import aq_base
from DateTime import DateTime
from struct import unpack
# code extracted from "OFS/History.py"
def getHistory(obj,firstIndex=0,lastIndex=20):
'''return the history records for *obj* between *firstIndex* and *lastIndex*.'''
try: parent= obj.aq_inner.aq_parent
except AttributeError: parent= None
r= obj._p_jar.db().history(obj._p_oid,None,lastIndex)
r= r[firstIndex:]
for d in r:
d['time']= DateTime(d['time'])
d['key']= '.'.join(map(str, unpack(">HHHH", d['tid'])))
h_obj= historicalRevision(obj, d['tid'])
if parent is not None and hasattr(h_obj,'__of__'):
h_obj= h_obj.__of__(parent)
d['obj']= h_obj
return r
def getObjectAt(obj,time):
'''return the object *obj* as it has been at *time*.'''
first= 0; last= 10; tc= obj.bobobase_modification_time()
if time >= tc: return obj
while 1:
ts= getHistory(obj,first,last)
if not ts: return None
for t in getHistory(obj,first,last):
if t['time'] <= time: return t['obj']
first= last; last*= 2
def makeCurrent(target,version):
'''make *version* current for *target*.'''
# code extracted from "OFS.History.Historical.manage_historyCopy"
# check, both *target* and *version* refer to the same object
if target._p_oid != version._p_oid:
raise ValueError, 'target and version refer to different objects'
state= version.__getstate__()
# Scrub the object before restoring the old state
base = aq_base(target)
base._p_changed=0
base._p_deactivate()
base.__setstate__(state)
base._p_changed=1
def getWorkflowHistoryAt(obj,time):
'''auxiliary to obtain workflow history at *time* as a standard dict.'''
wfh= getObjectAt(obj.workflow_history,time)
if wfh is None: return {}
d= {}
for k,v in wfh.items(): d[k]= v
return d
--
Dieter
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