Question

I have a problem with the following (simplified version) models:

Sponsor(models.Model):
     sponsor_name = models.CharField()

Concerts(models.Model):
     artist_name = models.CharField()
     sponsor = models.ManyToMany(Sponsor)

I go to the admin interface and add a new Sponsor, it automatically shows on any concert, all Sponsors show on all Concerts. That is not what I want, I want SOME sponsors to be on SOME concerts.

I realize this is a relationships problem.
I have tried:

Sponsor(models.Model):
     belongs_to = models.ForeignKey(Concerts)
     sponsor_name = models.CharField()

Concerts(models.Model):
     artist_name = models.CharField()

But now I can’t reuse sponsors, I have to add a new one for each Concert.

Answer 1

I think you’re mistaking possible values with actually chosen Sponsor in Concert model in django-admin interface.

Try this python manage.py shell and then from yourapp.yourmodel import Concerts; Concerts.objects.sponsor_set.all().
Result should contain only selected Sponsors for that model (I bet you’ll see empty list).