loop collection images paperclip

paperclip_loop.rb

    <% for asset in @post.assets %>

      <li><%= link_to image_tag(asset.asset.url(:thumb)), asset.asset.url(:original) %></li>

    <% end %>

undefined method `assets' for nil:NilClass

Extracted source (around line #12):

9:

10:

<% link_to post.title, post_path(post) %>

11:
12: <% for asset in @post.assets %>
13:
14:

<%= link_to image_tag(asset.asset.url(:thumb)), asset.asset.url(:original) %>

15:

please help

ok, sorry. that code was only for show.html.erb

but I am trying to view images in index.html.erb, how to do this? thanks, and thanks for your screencast, it's really good

one more thing, how can I limit the uploaded images? For ex. if I upload 5 images and then edit that post, I can upload another 5 images, and I end up having 10 images per post.
Thanks for this one too.