## controller

def index
  @forum_categories = ForumCategories.all
end

## view (this works)

<% @forum_categories.each do |forum_category| %>
  <h1><%= h(forum_category.name) %></h1>

  <ul>
     <% forum_categories.each do |forum| do %>
       <li><%= forum.topics.size %></li>
     <% end %>
  </ul>
<% end %>


## view (this works not!)

<% @forum_categories.each do |forum_category| %>
  <h1><%= h(forum_category.name) %></h1>

  <ul>
     <% forum_categories.each do |forum| do %>
       <li>
         <%= forum.topics.size %>
         (<%= forum.topics.size %>)
       </li>
     <% end %>
  </ul>
<% end %>

## The problem! (this worked on 2.1 edge but not the 2.2 edge)
In the last example, I've get "wrong number of arguments (2 for 1)"
on the second call to the forum.topics.size

## full error
vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:78:in `proxy_respond_to?'
vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:78:in `respond_to?'
/usr/lib/ruby/gems/1.8/gems/mislav-will_paginate-2.3.4/lib/will_paginate/finder.rb:155:in `respond_to?'
vendor/rails/activerecord/lib/active_record/associations.rb:1287:in `topics'
app/views/forums/index.html.erb:35
app/views/forums/index.html.erb:27
app/views/forums/index.html.erb:4:in `each'
app/views/forums/index.html.erb:4