base.rb

module InstanceMethods
   def can_moderate_community?
      self.community_admin? or self.community_moderator?
   end
end

show.html.erb

<div class="module">
  <div class="module_header">Posts [<%= @topic.posts.size %>]</div>
  <div>
    <table>
      <% @topic.posts.each do |post| %>
      <tr>
        <td class="post_author" rowspan="2">
          <span class="name"><%= post.user.username %></span>
          <span class="avatar"><%= image_tag post.user.try(:community_avatar) %></span>
          <span class="info smaller">
            Posts <%= post.user.posts.size %><br />
            Registered <%= post.user.created_at.to_s(:joined) %><br />
          </span>
        </td>
        <td class="post_header">
          <span class="left post_date smaller">Posted <%= post.created_at %></span>
          <span class="right post_controls smaller">
            <% if logged_in? %>
              <%= link_to "Reply", new_topic_post_path(@topic) %>
              <%= link_to "Quote", new_topic_post_path(@topic, :quote => post) %>
              <% if current_user == post.user || current_user.can_moderate_community? %>
                <%= link_to "Edit", edit_topic_post_path(@topic, post) %>
                <%= link_to "Delete", topic_post_path(@topic, post), :confirm => "Are you sure?", :method => :delete %>
              <% end %>
              <% if current_user.can_moderate_community? %>
                <%= link_to @topic.sticky ? "Unstick" : "Sticky", {:controller => 'community/topics', :action => 'update', :topic => {:sticky => @topic.sticky ? "false" : "true" }}, :method => :put %>
                <%= link_to @topic.locked ? "Unlock" : "Lock", {:controller => 'community/topics', :action => 'update', :topic => {:locked => @topic.locked ? "false" : "true" }}, :method => :put %>
              <% end %>
            <% end %>
          </span>
        </td>
      </tr>
      <tr>
        <td class="post_body">
          <%=raw post.body %>
        </td>
      </tr>
      <% end %>
    </table>
  </div>
</div>