Question

我想出了以下查询生成器，并且我得到的是准确的结果，除非我需要根据对论坛的点赞和话题总数对结果进行排序并根据其进行分页。

下面是查询生成器，其中没有针对热门的排序依据：

$limit = isset($_GET['limit']) && !empty($_GET['limit']) && is_numeric($_GET['limit']) ? (int) $_GET['limit'] : 10;

$page = isset($_GET['page']) && !empty($_GET['page']) && is_numeric($_GET['page']) ? (int) $_GET['page'] : 1;

$offset = ($page - 1) * $limit;

$forums = Forum::where('status', 1);

if(isset($_GET['search']) && !empty($_GET['search'])) {

    $search = trim($_GET['search']);

    $forums = $forums->where(function($query) use($search) {

        $query->where('title', 'LIKE', '%' . $search . '%')->orWhere('content', 'LIKE', '%' . $search . '%');

    });

}

if(isset($_GET['category']) && !empty($_GET['category'])) {

    $forums = $forums->whereIn('category_id', explode(',', trim($_GET['category'])));

}

if(isset($_GET['sortby']) && !empty($_GET['sortby'])) {

    $sortby = trim($_GET['sortby']);

    if($sortby == 'newest') {

        $forums = $forums->latest();

    } elseif($sortby == 'oldest') {

        $forums = $forums->oldest();

    } elseif($sortby == 'popular') {

        // Sort By: Popular | Logic: Total no of likes and threads to a forum

    } else {

        $forums = $forums->latest();

    }

} else {

    $forums = $forums->latest();

}

$forums = $forums->offset($offset)->limit($limit)->get();

我在论坛模型中定义了雄辩的关系，如下所示：

public function threads()
{

    return $this->hasMany('App\ForumThread', 'forum_id', 'id');

}

public function likes()
{

    return $this->hasMany('App\ForumLike', 'forum_id', 'id');

}

论坛表架构：

CREATE TABLE `forums` (
    `id` bigint(20) UNSIGNED NOT NULL,
    `category_id` int(10) UNSIGNED NOT NULL,
    `user_id` bigint(20) UNSIGNED NOT NULL,
    `title` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
    `content` longtext COLLATE utf8mb4_unicode_ci,
    `image` varchar(191) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
    `tags` text COLLATE utf8mb4_unicode_ci,
    `status` tinyint(3) UNSIGNED NOT NULL DEFAULT '1',
    `created_at` timestamp NULL DEFAULT NULL,
    `updated_at` timestamp NULL DEFAULT NULL,
    `deleted_at` timestamp NULL DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

论坛喜欢表模式：

CREATE TABLE `forum_likes` (
    `id` bigint(20) UNSIGNED NOT NULL,
    `forum_id` bigint(20) UNSIGNED NOT NULL,
    `user_id` bigint(20) UNSIGNED NOT NULL,
    `created_at` timestamp NULL DEFAULT NULL,
    `updated_at` timestamp NULL DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

论坛线程表架构如下：

CREATE TABLE `forum_threads` (
    `id` bigint(20) UNSIGNED NOT NULL,
    `forum_id` bigint(20) UNSIGNED NOT NULL,
    `user_id` bigint(20) UNSIGNED NOT NULL,
    `content` longtext COLLATE utf8mb4_unicode_ci NOT NULL,
    `created_at` timestamp NULL DEFAULT NULL,
    `updated_at` timestamp NULL DEFAULT NULL,
    `deleted_at` timestamp NULL DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

谢谢！

Answer 1

Counting Related Models
如果您想计算没有关系的关系的结果数实际加载它们时，您可以使用withCount方法，该方法将在生成的模型上放置一个{relation} _count列。

因此，您可以使用withCount()，然后按放置的列对结果进行排序。例如，“喜欢”关系：

} elseif ($sortby == 'popular') {
    $forums = $forums->withCount('likes')->orderBy('likes_count', 'desc');
}

Laravel：如何订购相关模型的结果？

1 个答案: