I'm adapting a legacy database for use with Django and I've come
across a problem I haven't been able to solve!
The database has ForeignKey fields which are sometimes 0, meaning
there is no related row in the other table. If this database used
NULL instead of 0 then I could use ForeignKey(Other, null=True) and
all would work fine, but it doesn't and I can't change it.
I've tried lots of different ways of making an adaptor to change the 0
into a None when read from the database but I haven't made it work (or
even get called!) yet - can anyone give me a clue?
I'm trying to subclass ForeignKey but none of the methods I override
(except __init__) seem to ever get called!
Eg ...
class ForeignKeyWithZeros(models.ForeignKey):
"""
A ForeignKey, but when the id is 0 the relation is considered to be NULL
Use with null=True
"""
def __get__(self, instance, *args, **kwargs):
# never gets called
print "Instance %r " % instance
def to_python(self, value):
# never gets called
print "to_python %r" % value
I'm using svn of few days ago.
Thanks
Nick
--
Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick
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