How to save extra field in join table in HATBM Cake1.2

Hi all,
I saw "Storing additional data on join table" https://trac.cakephp.org/ticket/828.
Having, two tables associated with HABTM: tags, posts, posts_tags
posts_tags{ post_id,tag_id,weight }

Can anyone help me showing how to use it, in the Post 's add or Post
's edit view in to populate "weight" field in posts_tags.weight
column?

I am thinking to use Checkbox options to select related
posts_tags.weight, And input text to enter weight.

I've been struggling with this issue for few weeks with HABTM where
the join table record is deleted and reinserted everytime, thus the
posts_tags.weight column were never saved?

Thanks

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