Laravel 5 > orderBy 上下票之差 > 分页

Question

假设我有以下数据库设置

用户table

id
name

个帖子table

id
post

票table

id
user_id
post_id
vote (1 = up, -1 = down)

...并且我们还假设我已正确设置每个一对多关系:)

如何查询按赞成票和反对票之差衡量的前 5 个帖子？

像这样的东西会很棒...

$posts = Post::whereHas('votes', function($query) {
    $query->orderByRaw('sum(\'vote\'), desc');
})->get();

...我想稍后分页。

Answer 1

正在工作:)

$posts = Post::has('votes')
    ->leftJoin('votes', 'votes.post_id', '=', 'posts.id')
    ->selectRaw('posts.*, sum(votes.vote) as votes_sum')
    ->groupBy('posts.id')
    ->orderBy('votes_sum', 'desc')
    ->paginate(5);

Laravel 5 > orderBy 上下票之差 > 分页

Laravel 5 > orderBy difference between up and down votes > pagination

pagination

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laravel

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