php - Laravel 5.3 对 sortBy 集合的分页

Question

为什么 paginate 方法在这个例子中不起作用？

$shopIds = Follower::whereUserId($user->id)->orderBy('created_at','desc')->get()->pluck('shop_id')->toArray();
            $shops = Shop::whereIn('id',$shopIds)->with('deals')->with('deals.likes')->paginate($this->perPage)->sortBy(function($likes) {
                return $likes->count();
            });
            dd($shops);

谢谢你的帮助;)

Answer 1

paginate 工作正常，但是 sortBy 方法给您带来了问题，因为当您使用 sortBy 时它会返回一个新集合.

最后，您的 $shops 是 Illuminate\Support\Collection 的实例，而不是 Illuminate\Pagination\LengthAwarePaginator 的实例。

你可以这样尝试:

$paginated_shops = Shop::whereIn('id',$shopIds)
                  ->with('deals')
                  ->with('deals.likes')
                  ->paginate($this->perPage);

$shops = $paginated_shops->sortBy(function($likes) {
        return $likes->count();
    });

$shops = new LengthAwarePaginator($shops, $paginated_shops->total(), $paginated_shops->perPage());

记得在类的顶部添加use语句:

use Illuminate\Pagination\LengthAwarePaginator;