draggable_element_js returns syntax error when used seperately

When generating draggable elements from a collection, I'd like to do something like this:

<%= javascript_tag do %>
<%- collection.each do |element| -%>

<%= draggable_element_js "element_#{element.id}" %>

<%- end -%> <% end %>

However, this returns the following javascript which results in a syntax error:

new Draggable(& quot;element_6& quot;, {revert:true});

NB: I edited the above, there's no space between the & and quot;, but your browser might translate it to " otherwise.

It works when you do the iteration outside of the javascript_tag, but the point of using draggable_element_js is that it won't generate a javascript tag for every element. I prefer that.

I now fix this by doing this:
..

<%= raw draggable_element_js "element_#{element.id}" %>

..

I'm not sure what the expected behaviour is for this method. If it's only meant to be used inside the javascript_tag method and not in an iteration, that should be documented somewhere. My solution feels like a workaround, not expected behaviour.