Nested form with has_many :through -- how to modify the "through" attributes

This question occurred to me as I was answering a different question. Given a has_many :through
relationship, where there are additional attributes in the :through model, how would you construct a
form so you could update those attributes?

#foo.rb
class Foo < ActiveRecord::Base
  has_many :bars
  has_many :bazzes, :through => :bars
  accepts_nested_attributes_for :bazzes
end

#bar.rb
class Bar < ActiveRecord::Base
  belongs_to :foo
  belongs_to :baz
  # also defines the 'blarg' attribute
end

#baz.rb
class Baz < ActiveRecord::Base
  has_many :bars
  has_many :foos, :through => :bars
end

So in a form_for  <at> foo, in fields_for :bazzes, how would I define a checkbox to set the 'blarg' attribute to
true or false? Does the nested  <at> foo.baz just have a magical #blarg attribute, even though that attribute
is defined in the linking model Bar?

Thanks,

Walter

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