Specify the database for a Django ModelForm instance

[Ben Finney]

Howdy all,

How can I specify which database (by its alias name) a Django ModelForm
should use?

(I've had trouble getting this question in to the Django forum, so I'm
trying here as this is still Python-related.)

A Django ModelForm knows its corresponding model, and the fields
included.

The ModelForm instance clearly knows how to specify a database,
internally. It can validate its fields against the database, and can
save a new model instance to the database. This implies its operations
have knowledge of which database to use.

What I need is to access that as an external user, when creating the
instance. I can't find how to specify any database other than the
default, when creating the ModelForm nor when it interacts with the
database.

What is the equivalent for using='foo' when instantiating a ModelForm
for the model, or calling its methods (ModelForm.clean, ModelForm.save,
etc.)?

-- 
 \       “The sun never sets on the British Empire. But it rises every |
  `\        morning. The sky must get awfully crowded.” —Steven Wright |
_o__)                                                                  |
Ben Finney