How to wrap every N elements in parent div in ERB (Rails)?

My members index page is simply a list of members, but I'd like every 3 members to be wrapped in a containing div (that will act like a row). So rather than:

<div class="member"></div>
<div class="member"></div>
<div class="member"></div>
<div class="member"></div>
<div class="member"></div>

I need the markup to be:

<div class="row">
  <div class="member"></div>
  <div class="member"></div>
  <div class="member"></div>
</div>
<div class="row">
  <div class="member"></div>
  <div class="member"></div>
</div>

I do have a solution, but I'm not happy with it. I have actually seen a better way to do it in ERB before, but can't find it again.

My current code:

<div class="row">
  <% @members.each do |member| %>
    <div class="member"><%=member.name%></div>
    <%= cycle("", "", "</div><div class=\"row\">".html_safe) %>
  <% end %>
</div>