Laravel雄辩的雄心勃勃用belongsToMany加载太慢

Question

I have users that can belong to groups in a many to many relationship. I'm trying to retrieve ( paginate ) users with all the groups they belong to. This works fine, but when I have 1000+ users, things get really slow, even though I'm only paginating 25 to 50 at a time. On my User model:

public function groups()
{
    return $this->belongsToMany('App\Models\UserGroup', 'group_user', 'user_id', 'group_id');
}

My query is:

User::with('groups')->paginate(50);

So if I have around 50 users total in the database (MySQL), everything is super fast (<= 300ms). But when I add 1000, even though I'm still only paginating up to 50 per page, it crawls (~3 seconds).

EDIT

Actually normal request with around 50 TOTAL users is ~100ms, not 300ms.

Answer 1

Thanks to Thiago Barcala's comment, I was able to analyze the query logs with:

\DB::enableQueryLog();
// perform query...
var_dump(\DB::getQueryLog());

And I found the issue. Basically, I had a with attribute on my groups model:

protected $with = [
    'features',
    'users'
];

So I have a bunch of users being returned, and they're getting their groups returned, and each of those groups are returning all of the users in them. So I was getting like 10MB worth of data returned all because of this relation including more relations. I removed the with and all is well.