#django

even when logging through admin login form backend attribute isn't added to user object

yacek19: why would it?

user.backend is __only__ set during the login

not for individual views, you have to use the data from the session there

+apollo13: okay, now it seems clear, thank you

hi, how can i get all Foo with a relation with Bar? https://dpaste.de/hxgJ

pares: Foo.object.filter(Bar__isnull=False)

pares: Foo.objects.(bar_set__isnull=False)

ok, thank you both

pares: you can set a related_name on the fk to make reverse relationships easier

is there a field lookup like __contains that checks for a set intersection?

or, asked differently: a user is an owner of a house which is located in a city. I want a list of all cities where a certain user owns a house.

how would I do that with the django ORM?

dbrgn: Cities.objects.filter(house_set__owner=myOwnerInstance) ?

Lauxley: oh, it's that simple... thanks :D

I didn't know that I could filter by attribute on a set, but it seems obvious now.

Hello people, I have two applications which have different models. I am trying to import model X of app A in my app B models.py and model Y of app B in my app A

I get cannot import model A error when I makemigrations

The models are not related or dependent on each other

Looney: you can reference models by string to avoid circular dependencies.

(e.g. in a foreignkey field)

OK, but what if I'm extending the model?

you can extend in one way, but what's the other relation?

if X extends Y then Y won't extend X.

models.ForeignKey('dashboard.models.Publisher') would be correct syntax if I import dashboard

I'm extending one way only

no, I think it's "dashboard.Publisher"

OK, let me check and report

maybe also check https://docs.djangoproject.com/en/dev/ref/model...