Rails - Aug 2007 - using multiple select form

I think this is a simple problem but I haven''t had any luck so far.

Here are the models involved:

Product has_and_belongs_to_many SubCategories
SubCategory belongs_to Category / has_and_belongs_to_many Products
Category has_many SubCategories

So when creating a new Product I have a multiple select form of
SubCategories grouped by the Categories they belong to.  I use
option_groups_from_collection_for_select to create the optgroups /
options.

When this form is submitted, the only parameter from this form is the
first one selected:

"sub_category"=>{"id"=>"3"} or whatever is
all that shows up.

Here is the view:
[select multiple="multiple" name="sub_category[id]"
id="sub_category[id]"]
            [%option_groups_from_collection_for_select(@categories,
:sub_categories, :name, :id, :name)
%]
        [/select]

(new to the mailing list, dunno if it eats html )

Thanks,

-Aaron


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