has_one :通过 =>多种的

发布于 2024-11-28 18:37:47 字数 250 浏览 1 评论 0原文

出席和凭证：

belongs_to :event
belongs_to :account

因此：出勤和凭证之间是 1 对 1 的关系。

有没有办法不用我想太多就能做到这一点？

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

注：实际上，我不介意想太多。

原文

Both Attendment & Vouching:

belongs_to :event
belongs_to :account

Therefore: 1 to 1 relationship between attendments and vouchings.

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

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

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

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苦行僧 2024-12-05 18:37:47

是的，我认为你不能为此使用 has_one 。假设我正确地阅读了本文，您有两种模型：

出勤
凭证

它们都存储 event_id 和 account_id。您想从出席模型中了解哪些凭证与出席共享相同的事件和帐户。我认为最简单的解决方案是在 attendment.rb 文件中编写一个方法。

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

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

Attendment
Vouching

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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