From: Andrew Chen <hangfei@...>
Date: 2008-02-22T06:14:56+09:00
Subject: Re: Where does instance_eval _magically_ set the variable to?

Todd,
There are some subtle difference between load and instance_eval.
In this case, instance_eval works, the load doesn't.

I still have no idea where the instance_eval put the variables at.

 >cat param.txt
name="John"
 >cat tmpl.txt
my name is: <%= name %>
 >cat erb_instance_eval.rb
#!/usr/bin/env ruby

require 'erb'

instance_eval(File.read("param.txt"))
#load "param.txt"
puts ERB.new(File.read("tmpl.txt")).result(binding)
 >./erb_instance_eval.rb
my name is: John


 >cat erb_load.rb
#!/usr/bin/env ruby

require 'erb'

#instance_eval(File.read("param.txt"))
load "param.txt"
puts ERB.new(File.read("tmpl.txt")).result(binding)
 >./erb_load.rb
(erb):1: undefined local variable or method `name' for main:Object
(NameError)
        from ./erb_load.rb:7
 >

Also, the load_yaml won't work, because I need to setup variables
dynamically.

Thanks
~Andrew Chen