From: Zach Moazeni <zach.moazeni@...>
Date: 2010-04-16T01:40:19+09:00
Subject: Re: own exception classes

Hey Bernard,

I use this philosophy when designing code with custom exceptions: Only 
create exceptions that you (or other developers using your code) will 
rescue from.

So if I notice I'm creating exceptions that never get rescued in my own 
code, and I don't have a valid reason for why another developer would 
rescue from it, I blast it.

Likewise, I treat:

  begin
  ..
  rescue StandardError
  ...
  end

and

  begin
  ..
  rescue
  ...
  end

As code smells, and refactor that by creating an exception.

Also if you do go down the path of creating custom exceptions, I've 
found that creating exceptions in the form of:

  class MyError < StandardError
  end

tends to be the cleanest, but of course your mileage may vary. Here's a 
link to a project I'm currently working on that defines it's own 
exceptions. 
http://github.com/zmoazeni/harvested/blob/master/lib/harvest/api/base.rb#L23

I hope this helps.

--
Zach Moazeni
http://simplechatter.com
-- 
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