View to edit many-to-many relationship with extra fields

http://docs.djangoproject.com/en/1.2/topics/db/models/#extra-fields-on-many-to-many-relationships

I have two models with a many-to-many relationship through another
table with extra fields. In this case, I have one extra field which
represents the weight of the relationship.

I'm working on a view to edit the relationships between the two
models. If we call the two models left-hand-side and right-hand-side,
then the view is specific to one instance of the LHS, and the purpose
of the view is to add relationships from that LHS-row to an arbitrary
number of pre-existing RHS-rows.

Writing a view that, given an instance of the LHS, adds a single
weighted relationship to an element on the RHS is pretty trivial.
Writing view that adds an arbitrary number of relationships to the
RHS is not that trivial, and that's what I would like to deliver to my
users.

So far the view for a particular LHS-instance renders a page with a
form to define a single additional relationship to the RHS. I have
included a basic ajax function that GETs another form to the page.
This is where the problem comes up: IDs of the form elements are going
to overlap, and I won't be able to handle this when the form is
POSTed.

I have thought of two options I could try to tackle this so far, both
with javascript. The first would be to increment an index and send
that through the ajax function to the view that returns a new form.
The second would be to hook into the POST submission and munge the
data before it's passed back to django to save model instances.

It seems to me that something like this, while not common, has to have
been done before in web apps. I was wondering if there were some
established patterns to do this sort of thing, and if I am on the
right track. I have searched a few places including django snippets
and packages to see if something like this has been done before, but I
couldn't find anything. I'm not sure if I'm using the best search
terms.

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