HAS_ONE：通过=＆GT;多 [英] has_one :through => multiple

问题描述

这两个Attendment和放大器;华信：

Both Attendment & Vouching:

belongs_to :event
belongs_to :account

因此​​：1至1 attendments和vouchings关系

Therefore: 1 to 1 relationship between attendments and vouchings.

有没有办法做到这一点没有我想得太多了？

Is there a way to do this without my thinking too much?

# attendment
has_one :vouching :through => [:event, :account]

注：我不介意想太多，实际上

Note: I don't mind thinking too much, actually.

推荐答案

是啊，我不认为你可以使用一个HAS_ONE这一点。假设我正确读这篇文章，你有两种模式：

Yeah i don't think you can use a has_one for this. Assuming I'm reading this correctly, you have two models:

Attendment 华信

Attendment Vouching

他们都存储一个EVENT_ID和ACCOUNT_ID。你想知道从attendment模型，什么华信股份相同的事件和帐户作为attendment。我认为这是最简单的解决方法是写你的attendment.rb文件中的方法。

They both store an event_id and account_id. You want to know from the attendment model, what vouching shares the same event and account as the attendment. I think the easiest solution for this is to write a method inside your attendment.rb file.

class Attendment < ActiveRecord::Base
  # belong to statements go here
  def voucher
    Voucher.where(:event_id => self.event_id, :account_id => self.account_id).first
  end
end

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