Optimizing collection filtering - php

Question

I have 3 models: Account - Partner - User, with the 3 in belongsToMany relations (account_user, account_partner). I would like to filter all the User partners, authorized by the User accounts.
I have wrote the basic foreach loop hell, and I would like to ask for some tips for optimizing this filtering (like evading n+1 and other problems).
$userPartners = [];
foreach (auth()->user()->accounts as $account) {
foreach ($account->partners as $partner) {
$inList = false;
foreach ($userPartners as $userPartner) {
if ($userPartner->id === $partner->id) {
$inList = true;
}
}
if (!$inList) {
$userPartners[] = $partner;
}
}
}
dd($userPartners);

Answer 1

Start by eager loading your relationships with load. This will avoid the N+1 problem:
$user = auth()->user()->load('accounts');
$userPartners = [];
$user->accounts->each(function ($account) use ($userPartners) {
$ids = $account->partners->pluck('id');
if (!in_array($account->id, $ids)) {
$userPartners[] = $account->partners->where('id', $account->id);
}
});

Answer 2

You can do something like this:
Controller.php
$userPartners = collect();
auth()->user()->accounts->each(function($account) use ($userPartners) {
$account->partners->each(function($partner) use ($userPartners) {
if(!$userPartners->contains('id', $partner->id)) $userPartners->push($partner);
});
});
dd($userPartners);