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Adding photos to blog comments using paperclip (nesting models?)
class Post < ActiveRecord::Base

      validates :name,  :presence => true
      validates :title, :presence => true,
                        :length => { :minimum => 5 }

      has_many :comments, :dependent => :destroy
      accepts_nested_attributes_for :comments


     # Paperclip

      has_attached_file :photo, :styles => { :small => "150x150>", :large => "360x360" },
                        :url => "/system/:class/:attachment/:id/:style_:basename.:extension",
                        :path => ":rails_root/public/system/:class/:attachment/:id/:style_:basename.:extension"

      validates_attachment_presence :photo
      validates_attachment_size :photo, :less_than => 5.megabytes
      validates_attachment_content_type :photo, :content_type => ['image/jpeg', 'image/png']
    end

class Comment < ActiveRecord::Base
  attr_accessor :photo_file_name, :photo_file_size, :photo_content_type

  belongs_to :post

  # Paperclip

    has_attached_file :photo, :styles => { :small => "150x150>", :large => "360x360" },
                      :url => "/system/:class/:attachment/:id/:style_:basename.:extension",
                      :path => ":rails_root/public/system/:class/:attachment/:id/:style_:basename.:extension",
                      :default_url => '/images/missing_:style.png'


    validates_attachment_presence :photo
    validates_attachment_size :photo, :less_than => 5.megabytes
    validates_attachment_content_type :photo, :content_type => ['image/jpeg', 'image/png']
end

<p id="notice"><%= notice %></p>

<p>
 <% if @post.photo? %>
   <%= image_tag @post.photo.url(:small) %>
 <% else %>
   No attachment available!
 <% end %>
</p>
<p>
  <b>Name:</b>
  <%= @post.name %>
</p>

<p>
  <b>Title:</b>
  <%= @post.title %>
</p>

<p>
  <b>Content:</b>
  <%= @post.content %>
</p>

<h2>Comments</h2>
 <%= render @post.comments %>

<h2>Add a comment:</h2>
<%= render "comments/form" %>

<br />

<%= link_to 'Edit', edit_post_path(@post) %> |
<%= link_to 'Back', posts_path %> |

<p>
 <%= image_tag comment.photo.url(:small) %>
</p>
<p>
 <b>Commenter:</b>
 <%= comment.commenter %>
</p>

<p>
 <b>Comment:</b>
 <%= comment.body %>
</p>

<p>
 <%= link_to 'Destroy Comment', [comment.post, comment],
                  :confirm => "Are you sure?",
                 :method => :delete %>
</p>

class Photo < ActiveRecord::Base
  belongs_to :post
  has_attached_file :data
end