Question

以下是我的模型，为了便于阅读，我剪了一些代码：

class Meeting < ActiveRecord::Base

    def Joiners

    # Never mind , this is a complex sql, i think you do not need to read it.

    Joiners = Ploy.connection.select_all("SELECT count(users.id) as joiner FROM `ploys` INNER JOIN `participants` ON `participants`.`ploy_id` = `ploys`.`id` INNER JOIN `users` ON `users`.`id` = `participants`.`user_id` where `participants`.`ploy_id`= #{self.id}")
    Joiners.rows[0][0]

    end

    def as_json(options={})
        super(methods: :Joiners)
    end

如果我使用

render json: @Meeting

它将使用 Joiners 属性呈现JSON。

{
  "Meeting":{
   ...

   "Joiners":15,

   ...
  }

  "Meeting":{
   ...

   "Joiners":13,

   ...
  }

}

所以：

我如何按加入者排序？

由于

Answer 1

您必须使用SQL ORDER BY

在查询结果中对其进行排序

渲染json和排序问题

1 个答案: