Michael Bayer wrote:
> On May 21, 2009, at 2:04 AM, jo wrote:
>
>
>> Michael Bayer ha scritto:
>>
>>> that is your own application changing the primary key of a loaded
>>> instance, which is a feature very old versions of SQLAlchemy did not
>>> support. Upgrade to any recent version of 0.4 or 0.5 and you wont
>>> have that issue anymore.
>>>
>>>
>> Is there any property in the instance to see its state before
>> flushing it?
>>
>
> here are the ways to check for changes, if thats what it is you're
> looking for. Most of them will still require that you upgrade from
> your very old version of SQLAlchemy:
>
> obj in session.dirty
> session.is_modified(obj)
>
> from sqlalchemy.orm import attributes
> history = attributes.get_history(obj, attrname)
>
>
I see, Michael, you are right, I need to upgrade my SQLAlchemy version.
In the meanwhile I did a last try, to trap the FlushError exception.
raise exceptions.FlushError("Can't change the identity of instance %s in
session (existing identity: %s; new identity: %s)" %
(mapperutil.instance_str(obj), obj._instance_key, instance_key))
FlushError: Can't change the identity of instance spe...@0x9f4b9ac in session
(existing identity: (<class 'sicer.BASE.model.tabelleCodifica.specie.Specie'>,
(u'0141',), None); new identity: (<class
'sicer.BASE.model.tabelleCodifica.specie.Specie'>, (u'08',), None))
in this way:
from sqlalchemy.exceptions import FlushError
try:
session.flush()
except FlushError:
session.expunge(obj)
... but, it seems an error from TG. What exactly do session.expunge ?
Page handler: <bound method Controller.save of
<sicer.BASE.controller.tabelleCodifica.specie.Controller instance at
0x9e9f30c>>
Traceback (most recent call last):
File "/var/lib/python-support/python2.4/cherrypy/_cphttptools.py", line 105,
in _run
self.main()
File "/var/lib/python-support/python2.4/cherrypy/_cphttptools.py", line 254,
in main
body = page_handler(*virtual_path, **self.params)
File "<string>", line 3, in save
File
"/usr/lib/python2.4/site-packages/TurboGears-1.0.3.2-py2.4.egg/turbogears/identity/conditions.py",
line 235, in require
return fn(self, *args, **kwargs)
File "<string>", line 3, in save
File
"/usr/lib/python2.4/site-packages/TurboGears-1.0.3.2-py2.4.egg/turbogears/controllers.py",
line 342, in expose
output = database.run_with_transaction(
File "<string>", line 5, in run_with_transaction
File
"/usr/lib/python2.4/site-packages/TurboGears-1.0.3.2-py2.4.egg/turbogears/database.py",
line 362, in sa_rwt
retval = dispatch_exception(e,args,kw)
File
"/usr/lib/python2.4/site-packages/TurboGears-1.0.3.2-py2.4.egg/turbogears/database.py",
line 360, in sa_rwt
req.sa_transaction.commit()
File "/usr/lib/python2.4/site-packages/sqlalchemy/orm/session.py", line 73,
in commit
t[1].commit()
File "/usr/lib/python2.4/site-packages/sqlalchemy/engine/base.py", line 670,
in commit
raise exceptions.InvalidRequestError("This transaction is inactive")
InvalidRequestError: This transaction is inactive
j
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