Using list_filter with an InLine model in Django

Question

Hello,

We are having problems getting the filtering in the admin interface working the way we would like it to.

We have the following:

models.py:

class Person(models.Model):
  first_name = models.CharField(blank=True)
  last_name = models.CharField(blank=True)

class Affiliation(models.Model):
  person = models.ForeignKey(Person)
  affiliation = models.CharField(choices=AFFILIATION_CHOICES)
  title = models.CharField(blank=True)

admin.py:

class AffiliationInline(admin.TabularInline):
  model = Affiliation

class PersonAdmin(admin.ModelAdmin):
  inlines = [ AffiliationInline, ]

admin.site.register(Person, PersonAdmin)

Each person can have multiple affiliations. On the admin screen for a Person, we want to be able to filter based on the affiliation field. Unfortunately, this does not appear to be possible with our current configuration. We would use a ManyToManyField to an Affiliation in the Person model, except for the fact that every Affiliation will have a different title.

Does anyone know of a way of doing this?

Bob Guidinger