Nesting content_tag in Rails 3 is counter-intuitive. This looks like it will work:
content_tag(:ul) do
collection.map do |item|
content_tag(:li, item.title)
end
end
But it doesn’t. You get an empty list:
<ul>
</ul>
What’s the deal? To fix it, use the concat method:
content_tag(:ul) do
collection.map do |item|
concat(content_tag(:li, item.title))
end
end