Laravel 如果在获取结果集后获取数据总数，分页会中断。知道为什么吗？

Question

public function index(Request $request)
    {

        $params = $request->except('_token');

        $profiles = Profile::filter($params);

        $resultsSet = [
            "result_count" => $profiles->count(),
            "data" => $profiles->skip( ($params['page_number'] - 1) * $params['page_size'] )->take($params['page_size'])->get()
        ];

        return json_encode($resultsSet);
    }

这是有效的。但是，一旦我切换 $resultSets 的顺序，当 page_number 大于 1 时，结果 count() 值开始给我 0。$resultsSet 的切换代码是：

$resultsSet = [
            "data" => $profiles->skip( ($params['page_number'] - 1) * $params['page_size'] )->take($params['page_size'])->get(),
            "result_count" => $profiles->count()
        ];

为什么会这样？谢谢。

Answer 1

这是因为 $profiles 数据在 skip 操作后被操纵，
您可以做的是克隆变量并像这样使用它以使您的计数不受影响。

    $profiles = Profile::filter($params);
    $temp = clone $profiles  // This is will make exact copy of your $profile variable

    $resultsSet = [
        "result_count" => $temp->count(),
        "data" => $profiles->skip( ($params['page_number'] - 1) * $params['page_size'] )->take($params['page_size'])->get()
    ];

现在即使您颠倒顺序，计数也不会受到影响

$resultsSet = [
            "data" => $profiles->skip( ($params['page_number'] - 1) * $params['page_size'] )->take($params['page_size'])->get(),
            "result_count" => $temp->count(),
        ];

希望我解释的很好

Laravel 如果在获取结果集后获取数据总数，分页会中断。知道为什么吗？

Laravel pagination breaks if fetching total count of data after getting the result set. Any idea why?

laravel

laravel-pagination