Michael Bayer ha scritto:
Please, can you quote my original message?
Google does not send me back the messages I post.
dont access the unloaded b attribute on o unless it is still
attached to its session. when you sess.close(), o is no longer
attached to a session.
Ok.
I usually call
Michael Bayer ha scritto:
the original mapping essentially expressed this relationship:
A -- cascade=all, delete-orphan -- B
in both directions. What that means is, there cannot be an A with no B
in the database, and there cannot be a B with no A in the database,
i.e. its either A-B or
dont access the unloaded b attribute on o unless it is still
attached to its session. when you sess.close(), o is no longer
attached to a session. also, dont say del o.b, or insure that you
reassign a blank list to o.b. before accessing it again. the del
operation deletes the list-based
im sorry, i meant a scalar value of None, not a blank list,since you
have uselist=False. Assign None to o.b instead of saying del o.b.
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Michael Bayer ha scritto:
the original mapping essentially expressed this relationship:
A -- cascade=all, delete-orphan -- B
in both directions. What that means is, there cannot be an A with no B
in the database, and there cannot be a B with no A in the database,
i.e. its either A-B or
Alan Franzoni ha scritto:
The problem is that it requires the explicit use of the session.
In my case this means that I can not delete the object inside a method
of my class.
class A(object):
def enableB(enable=True):
if enable:
self.b = B(...)
A better solution is to do
sess = object_session(self)
That's wonderful and I didn't know about it!
Finally I'll give up passing session around my code!
Thanks!
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Alan Franzoni [EMAIL PROTECTED]
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Manlio Perillo ha scritto:
Hi, I have a strange (for me) problem with backref.
SQLAlchemy version is 0.3.1-1 on Debian Etch.
Here is the code:
[...]
from sqlalchemy import * trans = conn.begin()
sess = create_session()
sess.update(o)
print o.b.z
del o.b
A
[italian mode]
Come va Manlio? Ci sente anche qui alla fine :-) io per la fine dell'anno
dovrei riuscire a finire il progetto su cui sto lavorando e potrò riprendere
finalmente il mio lavoro anche con python.it!
[/italian mode]
1st:
In order to use a transaction with a pre-existent connection,
Alan Franzoni ha scritto:
[italian mode]
Come va Manlio? Ci sente anche qui alla fine :-) io per la fine
dell'anno dovrei riuscire a finire il progetto su cui sto lavorando e
potrò riprendere finalmente il mio lavoro anche con python.it
http://python.it!
[/italian mode]
Hi Alan!
1st:
The problem is that it requires the explicit use of the session.
In my case this means that I can not delete the object inside a method
of my class.
class A(object):
def enableB(enable=True):
if enable:
self.b = B(...)
else:
del self.b
Not a big problem,
the original mapping essentially expressed this relationship:
A -- cascade=all, delete-orphan -- B
in both directions. What that means is, there cannot be an A with no B
in the database, and there cannot be a B with no A in the database,
i.e. its either A-B or both will be deleted. its
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