wrapping checkbox items with forme

gistfile1.erb

#use tag_wrapper
<ul>
  <%= f.input :accounts, :as=>:checkbox, :tag_wrapper => :li %>
</ul>


# output
<ul>
  <span class="label">Accounts</span><li><label class="option"><input checked="checked" id="user_account_pks_1" name="user[account_pks][]" type="checkbox" value="1"> TestAccount</label></li><li><label class="option"><input checked="checked" id="user_account_pks_2" name="user[account_pks][]" type="checkbox" value="2"> new user name</label></li>
</ul>