Inplace set operations broken

[Former user]

The _set_decorators() functions in orm/collections.py defines several "update" functions which it then aliases to inplace-assignment operators like __and__ and __or__. However, none of the functions are actually capable of standing in for these operators, since doing so requires a function to return the new, mutated object as its return value. Since none of the functions, as they stand, has a return statement, they all result in inplace assignments that result in None objects.

[Former user]

It turns out that all of the inplace-assignment set operations in ext/associationproxy.py have the same problem.

[Former user]

And, the ext/associationproxy.py routines have an additional problem, which is that the attempt that Python makes to do the assignment of the attribute to its own value breaks the instance in such a way that, at session flushing time, SQLAlchemy reports:

sqlalchemy.exceptions.AssertionError: Dependency rule tried to blank-out primary key column 'account_categories.account$' on instance 'AccountCategory@0xa47bacc'

[jek]

a230391a37e1f6b7aaef6adef4a57da24588432b

[Mike Bayer]

Removing milestone: 0.4.3 (automated comment)