<h1>
  <%= @post.title %>
</h1>

<p>
  <%= @post.body %>
</p>
<h1 class="comments">Comments</h1><br />
	<!-- #1 -->
	<% unless @post.comments.empty? %>
      <% @post.comments.each do |comment| %>
	    <p><%= h comment.body %><br /><small>Posted on <%= h comment.created_at %> by <%= comment.user_id.login  %></small>
	    </p>
	  <% end %>
	<% end %>

	<!-- #2 -->
	<h2 class="comments">Add a new Comment</h2><br />
	<% if logged_in? %>
	<%= render :partial => @comment = Comment.new,
	   :locals => { :button_name => 'Create'}%>
	<% else %>
	<p> Please <%= link_to "Login", login_path %> or <%= link_to "Sign Up", signup_path %> to enter a comment.  Thank you</p>
	<% end %>
<%= link_to 'Back', posts_path %>
<br /><%= debug(session) %>

----

controller

class CommentsController < ApplicationController
  before_filter :load_post
  # GET /comments
  # GET /comments.xml
  def index
    @comments = @post.comments.find(:all)

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @comments }
    end
  end

  # GET /comments/1
  # GET /comments/1.xml
  def show
    @comment = @post.comments.find(params[:id])
    @comment.user_id = @current_user
    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @comment }
    end
  end

  # GET /comments/new
  # GET /comments/new.xml
  def new
    @comment = @post.comments.build
    @post.comment.user_id = @current_user
    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @comment }
    end
  end

  # GET /comments/1/edit
  def edit
    @comment = @post.comments.find(params[:id])
  end

  # POST /comments
  # POST /comments.xml
  def create
    @comment = @post.comments.build(params[:comment])
    @comment.user_id = @current_user
    respond_to do |format|
      if @comment.save
        flash[:notice] = 'Comment was successfully created.'
        format.html { redirect_to(@post) }
        format.xml  { render :xml => @comment, :status => :created, :location => @comment }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @comment.errors, :status => :unprocessable_entity }
      end
    end
  end

  # PUT /comments/1
  # PUT /comments/1.xml
  def update
    @comment = @post.comments.find(params[:id])

    respond_to do |format|
      if @comment.update_attributes(params[:comment])
        flash[:notice] = 'Comment was successfully updated.'
        format.html { redirect_to(@post) }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @comment.errors, :status => :unprocessable_entity }
      end
    end
  end

  # DELETE /comments/1
  # DELETE /comments/1.xml
  def destroy
    @comment = @post.comments.find(params[:id])
    @comment.destroy

    respond_to do |format|
      format.html { redirect_to(post_comments_url) }
      format.xml  { head :ok }
    end
  end
  def load_post
    @post = Post.find(params[:post_id])
  end
end