From: Brian Candler <b.candler@...>
Date: 2011-05-20T00:06:32+09:00
Subject: Re: Generating Functions in Ruby

Have a look at how ActionView (from Rails) caches its compiled 
templates. It does this by defining methods on a module.

[actionpack/lib/action_view/template.rb]

      def compile(view, mod) #:nodoc:
...
        code  = arity.abs == 1 ? @handler.call(self) : 
@handler.call(self, view)

        source = <<-end_src
          def #{method_name}(local_assigns)
            _old_output_buffer = @output_buffer;#{locals_code};#{code}
          ensure
            @output_buffer = _old_output_buffer
          end
        end_src
...
        begin
          mod.module_eval(source, identifier, 0)
          ObjectSpace.define_finalizer(self, Finalizer[method_name, 
mod])
        rescue Exception => e # errors from template code
          if logger = (view && view.logger)
            logger.debug "ERROR: compiling #{method_name} RAISED #{e}"
            logger.debug "Function body: #{source}"
            logger.debug "Backtrace: #{e.backtrace.join("\n")}"
          end

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