title: ActiveAdmin - generate link to index, with filter preset?
body: <p>In an ActiveAdmin page, I would like to include a link to a list of related resources.  For example, given that a</p>
  <ul>
  <li>Site <code>has_many</code> Sections and,</li>
  <li>Section <code>belongs_to</code> a Site (in my ActiveRecord models),</li>
  </ul>
  <p>I would like my Site's show page to include a link to Sections within the site, which would go to the Section index page, with the Site filter preset.</p>
  <h3>Note that</h3>
  <ul>
  <li>I do <strong>not</strong> want to use ActiveAdmin's <code>belongs_to</code> function;</li>
  <li>I don't want nested resources for a number of reasons (depth of nesting &gt; 2, as well as usability concerns).</li>
  </ul>
  <p><strong>What I want is to generate a URL similar to the one ActiveAdmin generates if I first go to the Sections index page and then filter by Site.</strong></p>
  <p>The query parameter list generated by ActiveAdmin's filtering feature is pretty crazy; is there a helper method I could use to achieve this goal?</p>
  <p>Thanks!</p>