Laravel 在 withCount 方法上使用 where 子句

问题描述

我正在尝试使用这段代码对 laravel 的 eloquent 查询构建器的 withCount 方法执行 where 子句.

I am trying to do a where clause on withCount method of laravel's eloquent query builder using this piece of code.

$posts = Post::withCount('upvotes')->where('upvotes_count', '>', 5)->get();

这段代码给了我这个错误.

and this code is giving me this error.

SQLSTATE[42S22]:未找到列:1054 未知列upvotes_count"在where 子句"(SQL:select , (select count() from upvotes whereupvotes.upvoteable_id = posts.id 和 upvotes.upvoteable_type = AppPost) as upvotes_count from posts where upvotes_count > 5)

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'upvotes_count' in 'where clause' (SQL: select , (select count() from upvotes where upvotes.upvoteable_id = posts.id and upvotes.upvoteable_type = AppPost) as upvotes_count from posts where upvotes_count > 5)

所以我可以猜测的是 upvotes_count 没有被选中，因此没有找到该列，但是如果我执行这段代码.

So from what I can guess is that upvotes_count isn't selected and hence the column is not being found, BUT if I execute this piece of code.

$posts = Post::withCount('upvotes')->get();

然后我得到这个输出.

{
"id": 1,
"user_id": 15,
"title": "Voluptatum voluptas sint delectus unde amet quis.",
"created_at": "2016-10-07 13:47:48",
"updated_at": "2016-10-07 13:47:48",
"upvotes_count": 7
},
{
"id": 2,
"user_id": 2,
"title": "Molestiae in labore qui atque.",
"created_at": "2016-10-07 13:47:48",
"updated_at": "2016-10-07 13:47:48",
"upvotes_count": 2
},

这基本上意味着 upvotes_count 被选中，因此我真的很困惑如何解决这个问题.

Which basically means that upvotes_count is being selected, hence i am really confused about how to solve this problem.

(下面给出了我迄今为止尝试过的更多选项以及与之相关的相应错误.)

(More options that I tried so far are given below with the respective error associated to it.)

$posts = Post::where('id', $id)->withCount(['upvotes' => function($query) {
        $query->where('upvotes_count', '>', 5);
    }])->get();

错误.

SQLSTATE[42S22]: Column not found: 1247 Reference 'upvotes_count' not supported (forward reference in item list) (SQL: select , (select count() from upvotes where upvotes.upvoteable_id = posts.id and upvotes.upvoteable_type = AppPost and upvotes_count > 5) as upvotes_count from posts where id =1)

$posts = Post::where('id', $id)->with(['upvotes' => function($query) {
        $query->select('upvoteable_id AS upvotes_count');
    }])->where('upvotes_count', '>', 5)->get();

$posts = AppPost::where('id', $id)->with(['upvotes' => function($query) {
        $query->selectRaw('upvoteable_id AS upvotes_count');
    }])->where('upvotes_count', '>', 5)->get();

SQLSTATE[42S22]:未找到列:1054 Unknown column 'upvotes_count' in 'where clause'(SQL:从 posts 中选择 * 其中 id = 1 和 <代码>upvotes_count > 5)

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'upvotes_count' in 'where clause' (SQL: select * from posts where id = 1 and upvotes_count > 5)

<小时>

我只想在与父模型有关系的 count() 方法上使用 where 子句.

I just want to use where clause on a count() method which is in a relationship with a parent model.

推荐答案

您可以通过使用:

$posts = Post::withCount('upvotes')
         ->having('upvotes_count', '>', 5)
         ->get();

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