Meta-programming: output method body as text

I'm dynamically defining a method in a module, and I'd like to check that once the method is bound to a class instance that the body of the method is what I'm expecting. Is there a way to output (as text) of the body of a method?

Module controller_mixins.rb:

module ControllerMixin

  instance_eval "def search_by_vendor (*args) \n" \
    " @#{self.class.name.sub(/Controller/, '').tableize} = #{self.class.name.sub(/Controller/, '')}.find_all_by_vendor_id(params[:vendor_id])  \n"\
    "respond_to do |format| \n" \
    " format.html { render :template=>'/#{self.class.name.sub(/Controller/, '').tableize}/index',  :layout=>'vendor_info'} \n" \
    " format.xml  { render :xml => @#{self.class.name.sub(/Controller/, '').tableize} } \n" \
    "end \n"\
  "end \n"

end

class being mixed with:

class VendorOrdersController < ApplicationController
  # GET /vendor_orders
  # GET /vendor_orders.xml
  require 'controller_mixins'
  include ControllerMixin
 <rest of class>

So I'd like to see the implementation of the mixin when applied to VendorOrdersController probably via script/console for convenience.

UPDATE: Per @~/ I saved the string to a variable and puts'd it. That worked perfectly. Which brought to light an error in my code (the reason I wanted to see the code in the first place). Code below is much better, and works as expected.

module ControllerMixin

  def self.included(mod)
     method_body = "def search_by_vendor \n" \
      " @#{mod.name.sub(/Controller/, '').tableize} = #{mod.name.sub(/Controller/, '')}.find_all_by_vendor_id(params[:vendor_id])  \n"\
      "respond_to do |format| \n" \
      " format.html { render :template=>'/#{mod.name.sub(/Controller/, '').tableize}/index',  :layout=>'vendor_info'} \n" \
      " format.xml  { render :xml => @#{mod.name.sub(/Controller/, '').tableiz