Thanks for replying. I tried adding ->query before asking the question, because it seemed logical, but it didn't work as expected. This displays the url without the query string:

<%= url_for('/')->to_abs %>
[download]

But this displays absolutely nothing:

<%= url_for('/')->to_abs->query %>
[download]

Here's the weird part, a link made with "to_abs->query" works, but can't be right clicked ("Void" link with click handler) and when source is viewed the href appears to be blank:

<a href="<%= url_for('/')->to_abs->query %>"> Reload </a>
[download]

What is this voodoo?