[Fixed]-How to sort query set (or array) with more than one type of elements (classes) by common attribute using Django Python

Use the pipe to merge querysets:

combined = qs1 | qs2 | qs3

But this wont work for querysets from distinct models, at least not if they have diffferent fields. You will get an Cannot combine queries on two different base models. error.

A possible solution is to use itertools.chain, like in this blog post, which i quote here for reference.

from itertools import chain
result_lst = list(chain(queryset1, queryset2))

Now, you can sort the resulting list by any common field, e.g. creation date

from operator import attrgetter
result_lst = sorted(
    chain(queryset1, queryset2),
    key=attrgetter('created_at'))