I don't currently see a good way to do this, the querysets are merged during DjangoConnectionField.resolve_connection which grabs the default_queryset from the model's manager. I've had to extend my own DjangoFilterConnectionField to perform authorization checks. #79 purposes that the object nodes support a get_queryset method which would make this allot easier.

Thanks for your answer. I'm still learning Python/Django so thanks again for the explanation. :)
The idea would be to let us decide directly on the get_queryset method, like in https://docs.djangoproject.com/en/2.1/topics/db/managers/#modifying-a-manager-s-initial-queryset?

I'll try to follow #79 as well.

You would now define a ProjetNode.get_queryset to filter by user globally.