I had studied class methods in python but never really understood its application in Djnago. My coding life was going well without the use of it. But I came across a situation where class method will be useful.

My model:

class Example(models.Model):
    post_count = models.IntegerField(default=0)


@classmethod
def total_counts(cls):
    return cls.objects.values('post_views').annotate(sum logic)

In the above function, if I had used property decorator, i can only get a single object post_count because the object self is used. But if I use classmethod then I can count the post views of all the objects.

So my thought is that whenever we have to deal with all the objects instead of a self object we need class method. Is this correct?

Also, can we use this class method directly into our model serializer field just like we use property to serializer??