ForeignKey to abstract class (generic relations)

Question

I\'m building a personal project with Django, to train myself (because I love Django, but I miss skills). I have the basic requirements, I know Python, I carefully read the

Answer 1

An actual service can only be on one node, right? In that case when not have a field

node = models.ForeignKey('node', related_name='services')

in the service class?