From: Brian Candler <b.candler@...>
Date: 2010-10-22T03:41:56+09:00
Subject: Re: Erb location of exception in template

Leslie Viljoen wrote in post #956108:
> Hiya!
>
> Does anyone know how I can find the location in an Erb template file
> of a line that caused an exception?
>
> The result of calling erb.result(binding) in build.rb looks like this:
>
> ./dgp_api.rb:199:in `type': ArgumentError (ArgumentError)
>         from (erb):285:in `interpret'
>         from (erb):285:in `each'
>         from (erb):285:in `interpret'
>         from build.rb:26:in `interpret'
>         from build.rb:41
>
>
> I want to know which template line caused the exception in dgp_api.rb.
> If this can't be done with erb, can it be done with eruby or erubis?

erb can definitely do it, at least the command line tool can:

$ erb
hello
world
<% foo %>
the
end
^D
-:3: undefined local variable or method `foo' for main:Object 
(NameError)

So try looking at the source for that (it's /usr/bin/erb on my Ubuntu 
box).  The following code works for me:

require 'erb'

src = <<EOS
hello
world
<% foo %>
the
end
EOS

erb = ERB.new(src)
puts erb.result

#Result:
#(erb):3: undefined local variable or method `foo' for main:Object 
(NameError)

This is with:
$ ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]

HTH,

Brian.

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