Django - How to get a list of queryset grouped by attribute value

Question

class MyObject(models.Model):
    type = models.CharField()

    def __unicode__(self):
        return self.type


#the type could be anything, its not predictable
MyObject.objects.create(type='a')
MyObject.objects.create(type='b')
MyObject.objects.create(type='c')
MyObject.objects.create(type='a')

Is it possible to retrieve a list of queryset grouped by the type like that:

[[<MyObject: a>, <MyObject: a>], [<MyObject: b>], [<MyObject: c>]]

Answer 1

Here's one possible way:

grouped = dict()
for obj in MyObject.objects.all():
    grouped.setdefault(obj.type, []).append(obj)

That will yield a dict like:

{'a': [<obj>, <obj>], 'b':[<obj>]}

Answer 2

Maybe you need someting like groupby of itertools

 from itertools import groupby

 data = MyObject.objects.all()

 [list(result) for key, result  in groupby(data, key=lambda item: item['type'])]