I have a partial view called '_comment.erb', and it may be called by parent many times(e.g. in a loop). The '_comment.erb' looks like:

<script>
function aaa() {}
</script>

<%= comment.content %>
<%=link_to_function 'Do', 'aaa()' %>

You can see if the '_comment.erb' be called many times, that the javascript function 'aaa' will be re-defined many times. I hope it can be define only once, but I don't want to move it to parent view.

I hope there is a method, say 'run_once', and I can use it like this:

<%= run_once do %>
  <script>
  function aaa() {}
  </script>
<% end %>

<%= comment.content %>
<%=link_to_function 'Do', 'aaa()' %>

No matter how many time I call the '_comment.erb', the code inside 'run_once' will be run only once. What shall I do?