laravel_sketch/app/Modules/Mini/Services/FavService.php

<?php

namespace App\Modules\Mini\Services;

use App\Base\BaseService;
use App\Models\User\User;
use App\Models\User\UserFav;

class FavService extends BaseService
{
    public function fav($uid, $params)
    {
        $gid = $params['id'];

        $fav = UserFav::where("user_id", $uid)->where("goods_id", $gid)->first();
        if ($fav) {
            $fav->delete();
            return $fav;
        }

        $fav = new UserFav();
        $fav->user_id = $uid;
        $fav->goods_id = $gid;
        $fav->save();

        return $fav;
    }

    public function paginate(User $user, $params)
    {
        $p = UserFav::with("good")->where("user_id", $user->id)->paginate($params['page_size']);

        return [
            "total" => $p->total(),
            "page_total" => $p->lastPage(),
            "list" => array_values(array_filter(array_map(function (UserFav $model) {
                if (is_null($model->good)) {
                    return null;
                }
                return [
                    "id" => $model->id,
                    "name" => $model->good->name,
                    "thumb" => $model->good->thumb,
                    "status" => $model->good->status,
                ];
            }, $p->items()))),
        ];
    }
}