I wasn't able to get that script of yours to work, so I set a test up
quickly. If I add a product and select the different multi_fields I
get this as my $this->data:

Array
(
    [Product] => Array
        (
            [name] => socks
        )

    [Category] => Array
        (
            [Category] => Array
                (
                    [0] => 3
                )

        )

    [Color] => Array
        (
            [Color] => Array
                (
                    [0] => 1
                    [1] => 2
                )

        )

    [Size] => Array
        (
            [Size] => Array
                (
                    [0] => 1
                    [1] => 2
                )

        )

)

This corresponds with the way you should write to HABTM models as per
the documentation. I am not sure why your code is not working, but it
looks like you have an issue with the way you are programmatically
generating things in your app_controller and/or maybe an issue in the
add form.

I'll have another look tomorrow.
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