[Answered ]-Does Django requery every time I access a related model?

No. Once you have accessed it the first time, the related entity will be cached and subsequent lookups will not hit the db again.

Note though that this is a per-object cache: if for any reason you re-fetch the Foo instance, the cache will be lost and a call to bar will cause another query.

Also note that you can eliminate the extra call altogether by using select_related when you query Foo in the first place.