Answer by Petr Dvořáček for How can I combine two or more querysets in a Django view?

This recursive function concatenates array of querysets into one queryset.

def merge_query(ar):    if len(ar) ==0:        return [ar]    while len(ar)>1:        tmp=ar[0] | ar[1]        ar[0]=tmp        ar.pop(1)        return ar