My boss, created a model that represents an override to parts of other model
instances; the business logic demands that the model instances should be
uniquely defined by two attributes a and b
ie
o1.a==o2.a and o1.b==o2.b <==> o1 is o2.
I know that we can implement validation rules in the admin to ensure that this
is so, but he prefers to merge an existing instance into the new version at
save
time and also delete the existing one. Is that in fact possible with django's
orm?
I'm thinking of code somewhat like this
def save(self):
P=list(Over.objects.exclude(id=self.id).
filter(a=self.a,b=self.b).order_by('id'))
if P:
for p in P:
self.merge(p)
p.delete()
super(Over, self).save()
would this work?
--
Robin Becker
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