I don't think HABTM saves have changed from 1.1, so you should look at
the manual (Models, "Saving hasAndBelongsToMany Relations"), and
search this group, it has been covered before.
In your case, you will want to save something like:
if (!empty($this->data['Artist']))
{
// move the "genre_id" attribute into the Cake HABTM connection
$this->data['Genre']['Genre'] = array( $this->data['Artist']
['genre_id'] );
$this->Artist->create();
$result = $this->Artist->save($this->data);
}
Note - this is off the top of my head and I haven't used HABTM
associations much, but I think it's about right.
There have been a few helper functions made to enhance HABTM too, if
you just want to add / remove single associations rather than redoing
the whole lot.
http://bakery.cakephp.org/articles/view/alternative-methods-for-working-with-hasandbelongstomany-associations
http://bakery.cakephp.org/articles/view/add-delete-habtm-behavior
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