Hi all,

I have a model (A) which has a foreign key to another (B). I wish to
construct a query for all B which have an empty a_set.

This is possible with SQL, using something like:

SELECT b.id FROM b LEFT OUTER JOIN a ON b.id=a.b_id WHERE b.a_id IS
NULL;

How would I construct such a query using the Django ORM?

Thanks in advance,

Russell


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