Conditional tag wrapping in Rails / ERB - ruby-on-rails

Question

What would be the most readable and/or concise way to write this in ERB? Writing my own method isn't preferable, as I would like to spread a cleaner solution for this to others in my company.
<% #items.each do |item| %>
<% if item.isolated? %>
<div class="isolated">
<% end %>
<%= item.name.pluralize %> <%# you can't win with indentation %>
<% if item.isolated? %>
</div>
<% end %>
<% end %>
== Update ==
I used a more generic version of Gal's answer that is tag agnostic.
def conditional_wrapper(condition=true, options={}, &block)
options[:tag] ||= :div
if condition == true
concat content_tag(options[:tag], capture(&block), options.delete_if{|k,v| k == :tag})
else
concat capture(&block)
end
end
== Usage
<% #items.each do |item| %>
<% conditional_wrapper(item.isolated?, :class => "isolated") do %>
<%= item.name.pluralize %>
<% end %>
<% end %>

Answer 1

If you really want the DIV to be conditional, you could do something like this:
put this in application_helper.rb
def conditional_div(options={}, &block)
if options.delete(:show_div)
concat content_tag(:div, capture(&block), options)
else
concat capture(&block)
end
end
which then you can use like this in your view:
<% #items.each do |item| %>
<% conditional_div(:show_div => item.isolated?, :class => 'isolated') do %>
<%= item.name.pluralize %>
<% end %>
<% end %>

Answer 2

Try:
<% #items.each do |item| %>
<div class="<%= item.isolated? 'isolated' : '' %>">
<%= item.name.pluralize %>
</div>
<% end %>

Answer 3

I like PreciousBodilyFluids' answer, but it doesn't strictly do exactly what your existing method does. If you really cannot have a wrapping div, this may be prefereable:
<% #items.each do |item| %>
<% if item.isolated? %>
<div class="isolated">
<%= item.name.pluralize %>
</div>
<% else %>
<%= item.name.pluralize %>
<% end %>
<% end %>
A helper method to do all of this would probably look like this:
def pluralized_name_for(item)
if item.isolated?
content_tag(:div, item.name.pluralize, :class => 'isolated')
else
item.name.pluralize
end
end
Then your view code would look like this:
<% #items.each do |item| %>
<%= pluralized_name_for(item) %>
<% end %>