| actually, the save_or_update works too. merge() was supposed to be for restoring serialized instances back to the Session, but I think you can just take the instance right back as well. the main thing is that the Mapper is compiled; something needs to occur on the mapper in order for this to happen (and if you compile one mapper, it compiles them all).
On Jul 10, 2006, at 4:05 PM, Michael Bayer wrote: two changes:
line 17 of setup.py:
users.mapper.compile()
line 15 of test2.py:
change: session.save_or_update(u)
to: u = session.merge(u)
On Jul 10, 2006, at 3:49 PM, Michael Carter wrote: Ok, I've got a simple test case here.
There are three files:
setup.py
test1.py
test2.py
1. run setup.py to create the sqlite db file
2. run test1.py to create a user and pickle it
3. run test2.py to unpickle the user, check its attributes, and save it to the session
** Make sure test1 and test2 are run in seperate python processes
The assertion in test2.py fails for me. If i take it out, then the save_or_update fails with this error:
sqlalchemy.exceptions.InvalidRequestError: Detected a mapped object not present
in the current thread's Identity Map: '(<class 'setup.User'>, (1,), None)'. Use
objectstore.import_instance() to place deserialized instances or instances from
other threads
On 7/10/06, Michael Carter <[EMAIL PROTECTED]> wrote: er thats a little weird, when you unpickle the object, have all the
relevant classes had the same Mappers set up on them ? the _state
attribute is a class-level property accessor that will only be there
if the class has been set up with a mapper (as are all the other
properties for which youre looking for default values). the actual
data for _state is in the __dict__ as "_<classname>__sa_attr_state". Yeah, I definitely have the relevant classes set up the same when I pickle and unpickle the object, with the same mapper set up on both.
this is all class-level stuff thats not related to the instance being
in or out of a Session.
I know its class-level stuff, but what it has to do with being in or out of a Session is that you can't put it into the session if it doesn't have a _state attribute. I will attempt to write a simple test case.
-Michael
<setup.py> <test1.py> <test2.py>
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