Django/python How to get a list of id's from a list of Objects

Question

If I have a list of objects acquired by some query (in this case Django models).

friends = Friend.objects.friends(user1)

How can I get the list of ids, so I can use it to search another model, like this:

items = Item.objects.get(pk__in=friends_ids).order_by('date')

I'm pretty sure the lambda expressions should be able to do it but I can't figure it out...

David Buck · Accepted Answer · 2021-03-04 12:01:37Z

36

If the return value of the friends method is a QuerySet object, you can use QuerySet.values_list method:

friends_ids = friends.values_list('id', flat=True)

If it's not a QuerySet object, you can use list comprehension (This one can be used for both QuerySet and non-QuerySet one):

friends_ids = [friend.id for friend in friends]

edited Mar 4, 2021 at 12:01

David Buck

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answered Dec 25, 2014 at 14:07

falsetru

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1 Comment

Tim Over a year ago

It returns a list, no queryset. Good point in using the list comprehension... I was thinking way to complex and completely forgot about such an easy solution :).

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