Planet CakePHP

I've got a series of Post models that hasAndBelongsToMany Media models. In certain function calls inside of the Post model, I don't need to retrieve the entire list of Media models. However, when I use the following code:

$this->unbindModel( array('hasAndBelongsToMany' => array('Media')) );

// Rebind to get only the fields we need:
$this->bindModel(
        array('hasAndBelongsToMany' => array(
            'Media' => array(
                'className' => 'Media',
                'joinTable' => 'media_posts',
                'foreignKey' => 'post_id',
                'associationForeignKey' => 'media_id',
                'limit' => 1, 
                'fields' => array('Media.type', 'Media.path', 'Media.title')
            )
        )
    )
);
$this->find('all', $params);

This limit only works on one of the first retrieved Post model and all following Post models have no associated Media:

Array
(
    [0] => Array
        (
            [Profile] => Array
                (
                )

            [Media] => Array
                (
                    [0] => Array
                        (
                            [type] => photo
                            [path] => ''
                            [title] => ''
                        )

                )
        )

    [1] => Array
        (
            [Profile] => Array
                (
                )

            [Media] => Array
                (
                )

        )

)

Any suggestions would be great. Thanks!