From: Morton Goldberg <m_goldberg@...>
Date: 2007-12-07T16:04:13+09:00
Subject: Re: Custom error handling question

On Dec 6, 2007, at 6:04 PM, Anton Aylward wrote:

> Some enlightenment.
>
> Firstly, the CustomError.new goes in the block of code that is yeilded
> to, not in the wrapper.
>
> Secondly, even though I've found examples in the ruby libraray and  
> rails
> of handlers beign extended  and having methods of their own, I cna;'t
> get it o work.
>
> For example, in actionpack/lib/action_view/base.rb
> there is
>
>    begin
>         render_template(template_extension, template_source,
>                         template_file_name, local_assigns)
>       rescue Exception => e
>         if TemplateError === e
>           e.sub_template_of(template_file_name)
>           ....
>
> but when I try
>
> 	rescue CustomError => e
>             puts "Caught #{e.message.to_s}"
>             e.handle("#{e.message.to_s}",
>                      "#{e.setup2.to_s}", "#{e.string3.to_s}")

Is the 'puts "Caught #{e.message.to_s}"' being called? Do you see  
output from it? If the answer is NO, then my guess is that the  
statement in your code which raises a CustomError is not being called.

> the handle method doesn't get invoked.  I don't get an error message
> about it either.
>
> I have, of course
>
> class CustomError < StandardError
>
>   attr_accessor :setup1, :setup2, :setup3
>
>   def initialize(setup1, setup2, setup3)
>     @setup1 = setup1
>     @setup2 = setup2
>     @setup3 = setup3
>     puts "Custom Error handler registered with #{@setup1.to_s},
>                                                #{@setup2.to_s},
>                                                #{setup3.to_s}"
>   end
>
>   def handle( handle1, handle2, handle3)
>      puts "Custom error handler handled"
>      puts "\tsetup1 = #{@setup1}"
>      puts "\tsetup2 = #{@setup2}"
>      puts "\tsetup3 = #{@setup3}"
>      puts "\thandle1 = #{handle1}"
>      puts "\thandle2 = #{handle2}"
>      puts "\thandle3 = #{handle3}"
>   end
>
> end


Regards, Morton