SilverStripe random order for ArrayList() - php

Question

I know that we can randomly sort a DataList with the following:
$example = Example::get()->sort('RAND()');
But when I try to randomly sort an ArrayList it doesn't work. I can sort an ArrayList by ID DESC, but not with RAND().
Is there a way to make an ArrayList randomly sort its items?
Example:
public function AllTheKits() {
$kits = Versioned::get_by_stage('KitsPage', 'Live');
$kitsArrayList = ArrayList::create();
foreach ($kits as $kit) {
if ($kit->MemberID == Member::currentUserID()) {
$kitsArrayList->push($kit);
}
}
return $kitsArrayList;
}
In a page:
public function getKitsRandom() {
return $this->AllTheKits()->sort('RAND()');
}
This does not work in a template with <% loop KitsRandom %>

Answer 1

Not really. This is the best workaround I can come up with:
foreach($myArrayList as $item) {
$item->__Sort = mt_rand();
}
$myArrayList = $myArrayList->sort('__Sort');

Answer 2

You could randomly sort the DataList before you loop over it, instead of trying to randomly sort the ArrayList:
public function AllTheKits($sort = '') {
$kits = Versioned::get_by_stage('KitsPage', 'Live', '', $sort);
$kitsArrayList = ArrayList::create();
foreach ($kits as $kit) {
if ($kit->MemberID == Member::currentUserID()) {
$kitsArrayList->push($kit);
}
}
return $kitsArrayList;
}
public function getKitsRandom() {
return $this->AllTheKits('RAND()'));
}
As a side note, you can filter the original DataList to fetch KitsPages that relate to this MemberID in the Versioned::get_by_stage call:
public function AllTheKits($sort = '') {
$kits = Versioned::get_by_stage(
'KitsPage',
'Live',
'MemberID = ' . Member::currentUserID(),
$sort
);
$kitsArrayList = ArrayList::create($kits);
return $kitsArrayList;
}
You could also just do this:
return KitsPage::get()->filter('MemberID', Member::currentUserID())->sort('RAND()');
When you are viewing the live site this will only get the live KitPages.