One of the neet features of CakePHP's scaffolding is that it automatically populates your foreign key (belongsTo, hasAndBelongsToMany) fields in your forms.
Lets take a look at a simple example to illustrate this:
app/models/article.php:
class Article extends AppModel {
var $hasAndBelongsToMany = array(
"Tag"
);
}
app/models/tag.php:
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