How to create a Django formset with three or more related items?

I posted this question on SO, perhaps someone can answer it. http://stackoverflow.com/questions/32615421/

This Django doc explains inline formsets, and uses this nice example:

from django.db import models    class Author(models.Model):      name = models.CharField(max_length=100)    class Book(models.Model):      author = models.ForeignKey(Author)      title = models.CharField(max_length=100)    >>> from django.forms.models import inlineformset_factory  >>> BookFormSet = inlineformset_factory(Author, Book, fields=('title',))  >>> author = Author.objects.get(name='Mike Royko')  >>> formset = BookFormSet(instance=author)

Now, if I add a third model:

class Event(models.Model):      author = models.ForeignKey(Author)      location = model.CharField(max_length=100)

How do I create a formset that allows me to edit all three models? Suppose there were even more models with a ForeignKey to Author, how do I create a formset for that? For example,

class Store(models.Model):      author = models.ForeignKey(Author)      store = model.CharField(max_length=100)

There are now three related objects to Author. How do I create a formset for all four objects?

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