Hello all,
Earlier I was trying to filter for objects that had a set of other
objects related to them by a ManyToManyField. It's a bit awkward, and
I have a couple of proposals to improve it.
Consider the following models:
class Person(models.Model):
name = models.CharField(max_length=128)
class Group(models.Model):
persons = models.ManyToManyField(Person)
Consider a group g containing Persons p1 and p2. In order to filter
for groups containing p1 and p2, one has to construct a QuerySet
containing p1 and p2 and then pass that into the filter call.
I think a better syntax for this would be:
Group.objects.filter(persons__contains=[p1,p2])
The second problem I hit was if I wanted to filter to get Groups which
_only_ containing p1 and p2 then I have to do something like:
Group.objects.annotate(num_persons=Count('persons')).filter(num_persons=2).filter(persons=q)
where q is the QuerySet mentioned earlier.
This would be considerably nicer:
Group.objects.filter(persons=[p1,p2])
What do people think about this? Is it worth my looking into some code
to do it?
Cheers,
Dan
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