Laravel attach

use Illuminate\Database\Eloquent\Builder;

    // Retrieve posts with at least one comment containing words like foo%...

    $posts = App\Post::whereHas('comments', function (Builder $query) {

        $query->where('content', 'like', 'foo%');

    })->get();

    // Retrieve posts with at least ten comments containing words like foo%...

    $posts = App\Post::whereHas('comments', function (Builder $query) {

        $query->where('content', 'like', 'foo%');

    }, '>=', 10)->get();

    //id for single

    $user->reasons->attach($reasonId);

    //array for multiple

    $user->reasons->attach($reasonIds);

    $user->save();