Rails - Jan 2007 - Simple question on inserting child data

after doing a bunch of reading I have finally sat down to create a
simple app to dirve home a lor of the concepts to which have been read.
 So I figured a simple blog app is the best way to do it.  The bad
thing is that I am already hung up when creating replies to a blog
posting.

I can''t figure out how to insert the post_id value into the reply
table.  When creating a reply the user is directed to a page via a url
simular to the following http://localhost:3000/main/reply/4, with the
value 4 being the post_id that is being replied to.

In the controller I have:

class MainController < ApplicationController

  def index
    #display a list of the posts
    @posts = Post.find(:all, :order => "id desc")
  end

  def reply
    #display the post that is being replied to
    @post = Post.find(params[:id])
    @reply = Reply.new
  end

  def post_reply
    @reply = Reply.find(params[:id])
    redirect_to :index
  end

end

-------------------
Here if the form
<h2><%= @post.title %></h2>
<p>
    <%= @post.content%>
</p>

<% form_for :reply, :url => {:action => :post_reply} do |form| %>

    <label for="content">Reply:</label>
    <%= form.text_area :content, :rows => 8, :cols => 50 %>

    <%= submit_tag "Submit" %>
<% end %>

----------------
So within the post_reply method in the controller, how do I get that
post_id from the url, or do I have to create a hidden input tag
containing it?

Thanks for the help


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