如何在Ruby中的异常消息中添加信息？ [英] How do I add information to an exception message in Ruby?

问题描述

我正在使用的方法是

  strings.each_with_index do | string，i | 
 begin 
 do_risky_operation（string）
 rescue 
 raise $ !. class，string number＃{i}的问题：＃{$！}
 end 
 end 
  

理想情况下，我也想保留回溯。

有更好的方法吗？

解决方案

要重新启动异常并修改消息，保留异常类及其回溯，只需执行以下操作：

  strings.each_with_index do | string，i | 
 begin 
 do_risky_operation（string）
 rescue Exception => e 
 raise $ !,字符串号＃{i}的问题：＃{$！}，$ !.backtrace 
 end 
 end 
  

哪个会产生：

 ＃RuntimeError：字符串号0的问题：原始错误信息在这里
＃backtrace ... 
  

How do I add information to an exception message without changing its class in ruby?

The approach I'm currently using is

strings.each_with_index do |string, i|
  begin
    do_risky_operation(string)
  rescue
    raise $!.class, "Problem with string number #{i}: #{$!}"
  end
end

Ideally, I would also like to preserve the backtrace.

Is there a better way?

解决方案

To reraise the exception and modify the message, while preserving the exception class and its backtrace, simply do:

strings.each_with_index do |string, i|
  begin
    do_risky_operation(string)
  rescue Exception => e
    raise $!, "Problem with string number #{i}: #{$!}", $!.backtrace
  end
end

Which will yield:

# RuntimeError: Problem with string number 0: Original error message here
#     backtrace...

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