Rails中两个类之间的多个属植物关系 [英] multiple belongs_to relationships between two classes in Rails

问题描述

我有一个Transaction类。此类的每个对象都包括一个发行帐户，一个发送帐户和一个接收帐户。这些都是Account类的一个实例。在我的交易表中，我有issuer_id，sender_id和Receiver_id。

I have a Transaction class. Each object of this class includes one issuing account, one sending account and one receiving account. Each of these is an instance of Account class. In my Transaction table, I have issuer_id, sender_id and receiver_id.

我应如何指定交易和帐户之间的关系以便致电

How should I specify relationship between Transaction and Account so that I can call

transaction.issuer
transaction.sender
transaction.receiver

谢谢。

推荐答案

使用：class_name 指定类名（如果可以）不要从关联名称中猜测：

Use :class_name to specify the class name, when it can't be guessed from the association name:

class Transaction
  belongs_to :issuer,   :class_name => 'Account'
  belongs_to :sender,   :class_name => 'Account'
  belongs_to :receiver, :class_name => 'Account'
end

class Account
  has_many :issued_transactions,   :foreign_key => :issuer,   :class_name => 'Transaction'
  has_many :sent_transactions,     :foreign_key => :sender,   :class_name => 'Transaction'
  has_many :received_transactions, :foreign_key => :receiver, :class_name => 'Transaction'
end

您可以在文档。

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