When displayed in the Admin interfaces, I'd like to filter the values
of n, so that instances of N already linked to other instances of A
sharing the same instance of o are not shown:
so when you edit an instance of A (let's call it "a"), you see only
the instances of n in use by a and the unsed ones (in the context of
o).
The problem is that I am not allowd to write self.choices_for_n()
Does anybody know any solution for this?
class A(models.Model):
o = models.ForeignKey(O)
p = models.ManyToManyField(P)
n = models.ManyToManyField(N, limit_choices_to=self.choices_for_n())
def choices_for_n(self):
unwanted = []
for z in self.o.z_set.all():
if z.id == self.id:
continue
unwanted += [z.id for z in z.n]
for n in N.objects.exclude(id__in=unwanted):
yield n.id
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