How to get a proper and query with django where not exists statement

Question

So I have this query which I would like to use as a filter:

select * from api_document ad 
where not exists (
select 1
from api_documentactionuser ad2 
where ad2.user_id=4 and ad2.action_id=3 and ad.id = ad2.document_id 
limit 1
)

What I’ve tried with django is:

q = queryset.exclude(
        Q(documentactionuser__action__id=3)
        & Q(documentactionuser__user=current_user),
    )

while queryset is a queryset on the api_document table. When I print the generated query however, django keeps separating the two conditions into two queries instead of simply using and, which in turn gives me the wrong data back:

select * FROM "api_document" 
WHERE NOT (
    EXISTS(SELECT 1 AS "a" FROM "api_documentactionuser" U1 WHERE (U1."action_id" = 3 AND U1."document_id" = ("api_document"."id")) LIMIT 1) 
    AND EXISTS(SELECT 1 AS "a" FROM "api_documentactionuser" U1 WHERE (U1."user_id" = 1 AND U1."document_id" = ("api_document"."id")) LIMIT 1)
    )

I’ve tried chaining exclude().exclude(), filter(~@()).filter(~@()) and the above variant and it all returns nearly the same query, with the same data output

Asked By: einaeffchen

||

Source

Answer 1

Use ~Exists and specify the queryset you want to check

queryset.filter(
    ~Exists(DocumentationActionUser.objects.filter(action__id=3).filter(user=current_user)
)

SHould do the trick (untested – just typed this directly here, so beware of typos! 🙂 )

Answered By: michjnich

How to get a proper and query with django where not exists statement

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