How to create a triple-join table with Django

Question

Using Django\'s built in models, how would one create a triple-join between three models.

For example:

• Users, Roles, and Events are the models.
• Us

Answer 1

I'd model Role as an association class between Users and Roles, thus,

class User(models.Model):
     ...

class Event(models.Model):
     ...

class Role(models.Model):
     user = models.ForeignKey(User)
     event = models.ForeignKey(Event)

And enforce the one role per user per event in either a manager or SQL constraints.