From: Robert Klemme <shortcutter@...>
Date: 2010-07-28T20:10:07+09:00
Subject: Re: Accessing object in rescue block

On 28.07.2010 10:54, Florian Odronitz wrote:

> when I rescue an exception, is there a way to access the object where
> the exception was raised?
>
> For example:
>
> begin
>    "something".nonexistent
> rescue NoMethodError =>  e
>    # here
> end
>
> In the rescue block, can I access the String "something"?

There is no way I am aware of which allows for fetching the instance 
from the NoMethodError if this is what you want.  If you display the 
exception you will see a textual description probably derived from #inspect:

irb(main):001:0> begin
irb(main):002:1* "".foo
irb(main):003:1> rescue Exception => e
irb(main):004:1> puts e.display
irb(main):005:1> end
undefined method `foo' for "":String
=> nil
irb(main):006:0>

If that is not sufficient for you, you can reference a variable defined 
after "begin":

irb(main):006:0> begin
irb(main):007:1* x = ""
irb(main):008:1> x.foo
irb(main):009:1> rescue Exception => e
irb(main):010:1> p x
irb(main):011:1> end
""
=> ""
irb(main):012:0>

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/