[ZODB-Dev] Mounted Storage and ClassFactory problems

[Júlio Dinis Silva]

Hi,

I'm mounting a SubData.fs in MainData.fs using MountedFileStorage.

MainData.fs has the product "ProductA" which implements one ZClass
called "ZClassA".

SubData.fs doesnt have this product in Control_Panel, but has
a folder with lets say 1000 instances of objects of ProductA.ClassA.

The problem is that when I mount SubData.fs in MainData.fs all my ClassA
instances became "product broken" instances.

But this is strange because if I try to create an instance of ClassA in my 
mounted SubData.fs it works ok, but if I unmount subData.fs and mount it 
again the instance I created and that it was ok is now broken, "saying" the 
Broken Product message.

Whats happening here is that my mounted db are not getting the parent db 
classfactory correctly.

I know (http://cvs.zope.org/StandaloneZODB/ZODB/Mount.py?sortby=date),
that Mount.py was changed to address this ClassFactory issue and I dont
know If to became an standalone zodb some bug was introduced.

BottomLine, I am able to mount SubData.fs and create in it new instances 
from a ZClassA defined in MainData.fs. But when I mount SubData.fs already 
existing instance of ZClassA that are in SubData.fs became broken.

This doesnt happens with filesystem based products, and I am not
sure 100% that I've seen this working in the past, but since I'm seeing
the changes in ZODB to address this issue and specially revision 1.11.2.2:

>Mount no longer has any dependencies on the Zope package.  It was 
> >importing Zope.ClassFactory so that ZClasses could be loaded from the 
> >root database.
>Instead of importing the class factory now we just use the parent's
>class factory as the mounted database's class factory.  This solves >some 
>problems with the test suite (but apparently not all... :-( )

My main objective is to have a MainData.fs with my Zclass based product,
and instances of this product in a separated Data.fs.

I've tested MountedFileStorage and ExternalMount and zclass product broken 
problem happens with both products.

Is there a way to create a Data.fs With NO Control_Panel, i.e, with
only lets say a folder and some objects in that folder? No acl_users, no 
nothing else. Maybe If I can create that kind of Data.fs my problem is 
solved because I have only one Control_Panel from the MainData.fs.

Thanx for any help, comments.

Regards,
Julio Dinis Silva


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