Django and models with multiple foreign keys

I am new to Django and I've been impressed so far by its capabilities. I am playing with more complex models and I am have problem to use them properly. Using Django 1.3, I am trying to write a summary page which would present the three models below with the following structure. In other words, a

How to soft delete many to many relation with Django

A couple of days ago, I asked a question on StackOverflow about many- to-many relation and soft deletion (see http://stackoverflow.com/q/9374962/42024). I got a single answer telling me that I most likely bumped into a bug and filed one (see https://code.djangoproject.com/ticket/17746). It was