Ruby on Rails: 如何将对象从一个类别复制到另一个类别

Question

我正在尝试将一些最新的收件人（订户）复制到我的时事通讯应用程序中的新类别。我 运行 遵循 Rails 控制台中的代码行，但没有将收件人复制到新类别，而是将最新的 10 个收件人移到了新类别。看起来 recipient.clone 不工作。我正在使用 Ruby v2.0.0 和 Rails v3.2.11.

recipients = Recipient.where(category_id: 54).order('created_at DESC').take(10)
recipients.each{ |recipient| 
  @recipient_clone = recipient.clone
  @recipient_clone.category_id=63
  @recipient_clone.save
}

更新：

我试过了

recipients.each{ |recipient| 
  recipient.freeze
  @recipient_clone = recipient.dup
  @recipient_clone = @recipient_clone.category_id=63
  @recipient_clone.save
}

但它给出 NoMethodError: private method 'initialize_dup' called 错误。

Answer 1

这可能不是最干净的方法，但应该可行:)

recipients = Recipient.where(category_id: 54).order('created_at DESC').take(10)
recipients.each{ |recipient| 
  @recipient_clone = Recipient.new(recipient.attributes.except(:id))
  @recipient_clone.category_id=63
  @recipient_clone.save
}