Preview button causes an error in my code

It use to work great under rails 2 and now moving to rails 3 as caused开发者_JS百科 my code to have errors.

Error Message:

You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.each

Slice of code:

<div id="archive-list">
  <h4>Archives</h4>
  <ul>
  <% @archive_list.each do |item| -%>
<li><%= link_to(item[0], archive_url(:year => item[1], :month => item[2])) %></li>
  <% end -%>
  </ul>

there seems to be an issue with:

<% @archive_list.each do |item| -%>

with this line above

Any help would be great?

@archive_list is probably nil

do a puts @archive_list in the controller before rendering the view and check if it's nil

in the view you could do a <% if @archive_list.exists? %> before iterating over it, if it's an active record relation, or <% if @archive_list.blank? %> if it's something else (from the looks of the code it's the latter).