How would I perform this query in Django?

Question

class ExternalUser(models.Model):
    user = models.ForeignKey(User)
    external_account_id = models.CharField(max_length=200, null=True, blank=True)

class ExternalFriends(models.Model):
    external_user = models.ForeignKey(ExternalUser)
    external_account_id = models.CharField(max_length=200, null=True, blank=True)

Suppose I first get all ExternalFriends:

all_friends = ExternalFriends.objects.all()

OK, now I have a query set.

How do I SELECT * FROM ExternalUser WHERE external_account_id IN [ ...all_friends's external_account_ids... ] ?

What would be the Django equivalent?

Answer 1

当然可以更高效地完成，但是...

ExternalUser.objects.filter(external_account_id__in=[friend.id for friend in all_friends])