[Zope] From Zope 2.5.1 to Zope 2.7.6

[Peter Bengtsson]

On 6/22/05, Tim Suter <tsuter at cait.org> wrote:
> FWIW, here's the output of the old 2.5.1 install:
> 
...
> 
> So that tells me that there are many dependent on
> bobobase_modification_time.  What does that mean and what do I need to
> do about it?
>

It is completely wrong to rely on bobobase_modification_time because
that value changes when the object storage changes. It's much better
to use something like 'last_modified_date' that you control yourself
in your own code.

What happens when you import any object is that
bobobase_modification_time gets set to today() which might make all
your objects appear to be unordered because every time you refresh
(now on you zope276) they seem to jump around from place to place.

Solution is nasty but straight forward at least. On your (zope 2.5.1),
this product that you have instanciated as Knowledge, Argyle and
Helpdesk, do you have control over it's source code? Assuming it's a
python product it might look something like this::

class MyProduct(Folder):
    meta_type = 'My Product'
    def __init__(self, id, title):
      self.id = id
      self.title = title
    def getModTime(self):
        return self.bobobase_modifiation_time()

Now, what you need to do is to"copy" the bobobase_modification_time to
a new attribute.
 
class MyProduct(Folder):
    meta_type = 'My Product'
    def __init__(self, id, title):
      self.id = id
      self.title = title
      self.last_modified_date = DateTime()
    def getModTime(self):
        return self.last_modified_date
    def upgrade(self):
        self.last_modified_date = self.bobobase_modification_time()

And somewhere else you need to have a serious python script that loops
through all instances and runs upgrade() on each. Something like this:

for instance in context.objectValues('My Product'):
    instance.upgrade()

Good luck


> Thanks much for your assistance;
> 
> Tim
> 
> On Wed, 2005-06-22 at 17:33 +0100, Peter Bengtsson wrote:
> > Try something like this:
> > $ cd zopehome/Products/
> > $ grep -rn bobobase_modification_time .
> >
> > That will tell you if any of your diskbased python products rely on
> > bobobase_modification_time
> >
> > On 6/22/05, Tim Suter <tsuter at cait.org> wrote:
> > > Excuse the newbie question, but how would I find that out?
> > >
> > > I inherited this 'project' of upgrading Zope and migrating the data.  I
> > > have had NO help with it so I have been banging through it all the way.
> > >
> > > Thanks,
> > > Tim
> > > On Wed, 2005-06-22 at 16:22 +0100, Peter Bengtsson wrote:
> > > > Are any of your applications relying on the
> > > > 'bobobase_modification_time' attribute?
> > > > That's something that changes when you import a .zexp file which could
> > > > maybe explain why things appear differently now.
> > > >
> > > >
> > > > On 6/22/05, Tim Suter <tsuter at cait.org> wrote:
> > > > > I am upgrading our current Zope from 2.5.1 to Zope 2.7.6.  I have the
> > > > > new version installed as a different instance on a different server.
> > > > > The Zope 2.5.1 is in tact and what I am wondering is, how do you migrate
> > > > > everything from the older to the newer?  I thought exporting the .zexp
> > > > > out of Zope 2.5.1 would be ok.  However, when I import it into the new
> > > > > install, it isn't the same as the original.  For example, I exported
> > > > > knowledge.zexp from the 2.5.1 and imported into the 2.7.6.  Now, when I
> > > > > go to pull up the page that points to info related to this data, the
> > > > > subtopics are now listed below the contents of the original page.  In
> > > > > looking at the html (I am no HTML expert at ALL), it did not appear that
> > > > > there was even anything related to subtopics.  It must be a control from
> > > > > within the Zope management interface.
> > > > >
> > > > > I guess I just want to know how to migrate properly with little
> > > > > administrative effort.
> > > > >
> > > > > Thanks,
> > > > > Tim
> > > > >
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> > > >
> > > >
> > >
> > >
> >
> >
> 
> 


-- 
Peter Bengtsson, 
work www.fry-it.com
home www.peterbe.com
hobby www.issuetrackerproduct.com