Combine multiple querysets from different models and sort by shared column (which can be fed into paginator)

combine_querysets.py

from itertools import chain
from operator import attrgetter

collection = Collection.objects.get(pk=id)
document_list = collection.documents.all()
task_list = collection.tasks.all()

item_list = sorted(
    chain(document_list, task_list),
    key=attrgetter('created'),
    reverse=True
)

paginator = Paginator(item_list, 10)