Limit and shuffle finder results

Hi
I have a finder for some categories and I want to shuffle the results and limit them.
Since I don't want to always return the first x of the results, I am not limiting in the finder itself.

My code is as follows:

PHP:

$categoryFinder = $this->finder('****')
    ->where('category_id', $categoryIds);

$categories = $categoryFinder->fetch();
$categories = $categories->shuffle();

$categories = $categories->slice(0, $limit);

I am wondering if there is a better (built in maybe?) way to do...

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