I'm having some difficulty understanding how 'fields' is supposed to
work when doing a find('threaded'). The following is a method in my
Comment model. Comment can be associated with either Post or Gallery,
hence the 'model' & 'association_key' fields.

public function threaded($key  = null, $model = null)
{
        if (!$key || is_null($model)) return null;

        $filters = array(
                'conditions' => array(
                        'Comment.model' => ucfirst($model),
                        'Comment.association_key' => $key
                ),
                'fields' => array(
                        'Comment.created',
                        'Comment.parent_id',
                        'Comment.lft',
                        'Comment.rght',
                        'Comment.model',
                        'Comment.association_key',
                        'Comment.user_id',
                        'Comment.subject',
                        'Comment.body'
                ),
                'order' => array('Comment.lft' => 'ASC'),
                'contain' => array(
                        'User' => array(
                                'fields' => array('User.id', 'User.login')
                        )
                )
        );

        return $this->find('threaded', $filters);
}

When I use it like that, I do not get properly threaded results--
comments that should have children do not.

When I change the fields array (the first one, for Comment) to '*' the
results are properly threaded. However, the User arrays contain all
fields for that model. In the first example, the User results
correctly contain just the id & login fields.

So, am I missing something? Bug?
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