try this

gistfile1.txt

def group_li_formatting(collection, column_one, column_two, column_three, options = {})

  html_attributes_options(options)
  li_default_options = {'data-role'=>"list-divider"}

  list = collection.collect do |created, post|
   tags = [content_tag("li", created, li_default_options)]
     tags += post.collect do |p|
       content_tag("li", "<h3>p.column_one</h3><p><strong>p.column_two</strong></p><p>p.column_three</p>".html_safe)
     end
     
      tags
   end
 
  content_tag(:ul, list.join.html_safe, default_options.update('data-inset' => 'false'))
end