Setting a default value for a select widget in a modelformset

We have a modelformset created like this:

DocumentFormSet = modelformset_factory(Document, extra=0,
fields=('name', 'category')

with a models.py like this:

class Category(models.Model):
name = CharField(max_length=100)
# other stuff

class Document(models.Model):
name = CharField(max_length=100)
category = ForeignKey(Category)
# other stuff

When the DocumentFormSet renders, category appears as a select widget.

I have a variable in my request session that I would like to use to
set the initial value of the category widget.

What would be the best way to go about this? Is it necessary to create
a custom widget to achieve this?

--
steve

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