[Zope-dev] zope.session storage error

Marius Gedminas marius at gedmin.as
Tue Oct 14 13:21:23 CEST 2014

On Tue, Oct 14, 2014 at 12:13:56AM +0200, Simon Elbaz wrote:
> Hi,
> Could someone explain me why the following code:
>     if ISession(self.request)['cdc_adama'].__contains__('current_customer'):
>         ISession(self.request)['cdc_adama'].__delitem__('current_customer')
>     ISession(self.request)['cdc_adama']['current_customer'] = customer

First, a style issue: please don't use __contains__ or __delitem__ this
way.  Use the idiomatic Python spelling:

    if 'current_customer' in ISession(self.request)['cdc_adama']:
        del ISession(self.request)['cdc_adama']['current_customer']
    ISession(self.request)['cdc_adama']['current_customer'] = customer

> triggers the error:
>   File
> "/home/simon/ADAMA/Src/gui/z3c_dunning/eggs/ZODB-4.0.0a4-py2.7.egg/ZODB/serialize.py",
> line 352, in persistent_id
>     "database connection", self._jar, obj,
> InvalidObjectReference: ('Attempt to store an object from a foreign
> database connection', <Connection at 7966348c>,
> <zope.container.btree.BTreeContainer object at 0x7a61282c>)
> Is the zope.session module opening a new ZODB connection ?

It's not about different ZODB connections.  It's about objects being
stored in different databases.  And that depends on how your session
storage is configured in your application.  For example, if you use
RAMSessionDataContainer then session data lives in a memory-only

Perhaps you can store just the customer ID instead of the entire object?

Marius Gedminas
http://pov.lt/ -- Zope 3/BlueBream consulting and development
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