Question

为什么paginate方法不适用于此示例？

$shopIds = Follower::whereUserId($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);

感谢您的帮助;）

Answer 1

paginate工作正常，但sortBy方法正在为您创建问题，因为当您使用sortBy时，它会返回一个新的集合。

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

您可以尝试：

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

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

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

请记住在课程顶部添加use语句：

use Illuminate\Pagination\LengthAwarePaginator;

Answer 2

谢谢你们！

我解决了这个问题

$shopIds = Follower::whereUserId($user->id)->orderBy('created_at','desc')->get()->pluck('shop_id')->toArray();
            $shopIds = Shop::whereIn('id',$shopIds)->with('deals')->with('deals.likes')->get()->sortBy(function($likes) {
                return $likes->count();
            })->pluck('id')->toArray();
            $orderedIds = implode(',',$shopIds);
            $shops = Shop::whereIn('id', $shopIds)->whereNotIn('user_id', [$user->id])->orderByRaw(\DB::raw("FIELD(id, ".$orderedIds." )"))->paginate($this->perPage);
            dd($shops);

现在我有一个Illuminate \ Pagination \ LengthAwarePaginator的实例

感谢的

Answer 3

就像@Amit提到的那样，$ shops是一个集合，因此不是LengthAwarePaginator。你将不得不构建分页器并自己切片......不要太复杂......

例如，让我们假设您正在按照您的路线，呼叫您的控制器...然后将结果返回到视图...现在该路线将通过请求中的分页信息获得请求，您工作是将结果$ shop放到一个数组中，将数组切成适合页面的结果并将其返回到您的视图...我没有运行此代码...所以以此为例...但是它看起来像是：

public function yourController{

    // This will return a collection... we will convert it to array later
    $shops = Shop::whereIn('id',$shopIds)->with('deals')->with('deals.likes')->paginate($this->perPage)->sortBy(function($likes) {
            return $likes->count();
        });

    $shopsArray = $shops->toArray();

    // Here we deal with the slicing... you need to slice the page you are
    // at the paging info is in the request... 

    // this basically gets the request's page variable... or defaults to 1
    $page = Paginator::resolveCurrentPage('page') ?: 1;

    // Assume 15 items per page... so start index to slice our array
    $startIndex = ($page - 1) * 15;

    // Length aware paginator needs a total count of items... to paginate properly
    $total = count($shopsArray);

    // Eliminate the non relevant items by slicing the array to page content...
    $results = array_slice($shopsArray, $startIndex, 15);

    $result =  new LengthAwarePaginator($results, $total, 15, $page, [
        'path' => Paginator::resolveCurrentPath(),
        'pageName' => 'page',
    ]);
    return view('yourView', compact('result'));
}

Laravel 5.3对sortBy集合的分页

3 个答案: