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The Rails new_controller script would've generated something like the following:

require 'abstract_application'
require 'forum_helper'
class ForumController < AbstractApplicationController
  include ForumHelper

end

For our purpose, we'll need to change a few things:

When showing a Post, show all its Comments as well
Override default "List comments" function to "List Posts" instead.
When doing "List Posts", exclude Comments stored in the same table

With those requirements, I present:

require 'abstract_application'
require 'forum_helper'
require 'post'
require 'comment'

class ForumController < AbstractApplicationController
  include ForumHelper

  scaffold :post
  scaffold :comment, :suffix => true

  def show
    # when showing a Post, i need to retrieve all the comments too
    # thus @post and @comments is populated here.
    sqlId = ForumController.quote(@params["id"])
    @post = Post.find(@params["id"]);
    @comments = Comment.find_all "post_id = #{sqlId}"

    # after populating our variables, we'll call scaffold to render
    # using the 'show.rhtml'
    render_scaffold
  end

  def list_comment
    # default action "list_comment" will show all the comments in
    # the database, doesn't make sense in our app - so redirect to
    # the list topics screen

    list
  end

  def list
    # The 'type' column is automagically used by Rails.. when inserting
    # a comment, it put 'Comment' as its 'type' value
    # Hence, to get all the topics, we'll get the 'type is null'..

    @posts = Post.find_all "type is null order by created_at desc limit 30"
    render_scaffold
  end

  # Java programmers, this is a static / class function
  # Putting this function here because I still haven't learnt to
  # use Rails / ActiveRecord for this purpose..
  def ForumController.quote(value)
    case value
      when String              then "'#{value.gsub(/\\/,'\&\&').gsub(/'/, "''")}'" # ' (for ruby-mode)
      when NilClass            then "NULL"
      when Float, Fixnum, Date then "'#{value.to_s}'"
      when Time, DateTime      then "'#{value.strftime("%Y-%m-%d %H:%M:%S")}'"
      else                          "'#{value.to_yaml}'"
    end
  end

end

If you're ready. We'll move on to the 'view' portion of the MVC pattern.

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