Question

I’m trying to figure out how to write a ‘not in’ style query in django.
For example, the query structure I’m thinking of would look like this.

select table1.* 
from table1
where table1.id not in 
(
  select table2.key_to_table1
  from table2 
  where table2.id = some_parm 
)

What would the django syntax look like assuming models called table1 and table2?

Answer 1

table1.objects.exclude(id__in=
    table2.objects.filter(your_condition).values_list('id', flat=True))

The exclude function works like the Not operator you where asking for. The attribute flat = True tells to table2 query to return the value_list as a one level list. So… at the end you are obtaining a list of IDs from table2, which you are going to user to define the condition in table1, that will be denied by the exclude function.