优化集合过滤

Question

我有3个模型：帐户 - 合作伙伴 - 用户，其中3个属于belongsToMany关系（account_user，account_partner）。我想过滤所有用户帐户授权的用户合作伙伴。

我已经编写了基本的foreach循环地狱，我想问一些优化这种过滤的技巧（比如逃避n + 1和其他问题）。

$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

首先急切加载与load的关系。这样可以避免N+1问题：

$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

您可以这样做：

<强> Controller.php这样

$userPartners = collect();
auth()->user()->accounts->each(function($account) use ($userPartners) {
    $account->partners->each(function($partner) use ($userPartners) {
        if(!$userPartners->contains('id', $partner->id)) $userPartners->push($partner);
    });
});
dd($userPartners);