Question

<% @feed.each do |feed| %>

    <ul id="feed">

        <%= 
            case feed.action_type
            when "COMMENT"
                <%= render :partial => "feeds/storyitem" -%>,
            end
        %>
    </ul>
<% end %>

Answer 1

You can’t nest ERB tags like that — you’re trying to insert the render... ERB tag when you’re already inside ERB. If that’s what you really want to do, try this:

<% @feed.each do |feed| %>

    <ul id="feed">
        <% case feed.action_type
        when "COMMENT" %>
            <%= render :partial => "feeds/storyitem" -%>,
        <% end %>
    </ul>
<% end %>

But unless you’ve simplified the code example for posting it here, the <% if %> looks clearer to me.