remove() isn't implemented yet.While the simple operation you see below
would be fine for a single listener on a single target, the targets we have
which propagate to subclasses (mapper events, attribute events) would require a
more elaborate system that can revisit everywhere the event has been propagated
and remove it from there as well.
this is why remove isn't published in the docs right now.
In our own tests I use a hack to remove an entire set of listeners at once, if
this is a testing teardown scenario you're dealing with.
Otherwise, ad-hoc removal on a per operation basis ? I knew someone would
try it though damned if I could imagine what possible use there could be for
that. If this is the case here, care to entertain me ?
On Aug 18, 2011, at 10:10 AM, sandro dentella wrote:
Hi,
I started to play with events to port a library to sqla 0.7. I managed to use
the 'listen' function but I failed on 'remove'. Looking at the signatures
they seem to be just the same, but here is what I get:
In [7]: event.listen(obj.__class__.title, 'set', listen_cb)
In [8]: event.remove(obj.__class__.title, 'set', listen_cb)
---
TypeError Traceback (most recent call last)
/home/misc/src/hg/py/sqlkit-pub/demo/sql/demo.py in module()
1
2
3
4
5
/misc/src/sqlalchemy/sqlalchemy/lib/sqlalchemy/event.pyc in remove(target,
identifie
69
70 for evt_cls in _registrars[identifier]:
--- 71 for tgt in evt_cls._accept_with(target):
72 tgt.dispatch._remove(identifier, tgt, fn, *args, **kw)
73 return
TypeError: 'InstrumentedAttribute' object is not iterable
Did I misundertand the syntax or what else?
TIA
sandro
*:-)
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