如何在 Ruby 1.8.5 中重新传递多个方法参数？

发布于 2024-10-05 06:30:31 字数 557 浏览 1 评论 0原文

我正在使用 ruby 1.8.5，我想使用一个辅助方法来帮助过滤用户的偏好，如下所示：

def send_email(user, notification_method_name, *args)
  # determine if the user wants this email
  return if !user.send("wants_#{notification_method_name}?")

  # different email methods have different argument lengths
  Notification.send("deliver_#{notification_method_name}", user, *args)
end

这在 ruby 1.8.6 中有效，但是当我尝试在 1.8.5 中执行此操作并尝试发送超过一个 arg 我收到如下错误：

参数数量错误（X 为 2）

其中 X 是特定方法所需的参数数量。我不想重写所有通知方法 - Ruby 1.8.5 可以处理这个问题吗？

原文

I'm using ruby 1.8.5 and I'd like to use a helper method to help filter a user's preferences like this:

def send_email(user, notification_method_name, *args)
  # determine if the user wants this email
  return if !user.send("wants_#{notification_method_name}?")

  # different email methods have different argument lengths
  Notification.send("deliver_#{notification_method_name}", user, *args)
end

This works in ruby 1.8.6, however when I try to do this in 1.8.5 and try to send more than one arg I get an error along the lines of:

wrong number of arguments (2 for X)

where X is the number of arguments that particular method requires. I'd rather not rewrite all my Notification methods - can Ruby 1.8.5 handle this?

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探春 2024-10-12 06:30:32

一个很好的解决方案是使用哈希切换到命名参数：

def  send_email(args)
  user = args[:user]
  notification_method_name = args[:notify_name]

  # determine if the user wants this email
  return if !user.send("wants_#{notification_method_name}?")

  # different email methods have different argument lengths
  Notification.send("deliver_#{notification_method_name}", args)
end

send_email(
  :user        => 'da user',
  :notify_name => 'some_notification_method',
  :another_arg => 'foo'
)

A nice solution is to switch to named-arguments using hashes:

def  send_email(args)
  user = args[:user]
  notification_method_name = args[:notify_name]

  # determine if the user wants this email
  return if !user.send("wants_#{notification_method_name}?")

  # different email methods have different argument lengths
  Notification.send("deliver_#{notification_method_name}", args)
end

send_email(
  :user        => 'da user',
  :notify_name => 'some_notification_method',
  :another_arg => 'foo'
)

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