Trying to translate this WORKING html/jQuery code into html.erb in Rails. Tearing my hair out.

Trying to create a form to enter booleans into a db table, using checkboxes. Found this code on http://jsfiddle.net/3uf7D/ .

Javascript

    $(document).ready(function() {
        // Whenever the parent checkbox is checked/unchecked
        $(".parentcheckbox").change(function() {
                // save state of parent
            c = $(this).is(':checked');
            $(this).parent().find("input[type=checkbox]").each(function() {
                // set state of siblings
                $(this).attr('checked', c);
            });
       });
    // Update parent checkbox based on children
        $("input[type=checkbox]:not('.parentcheckbox')").change(function() {
            if ($(this).closest("div").find("input[type=checkbox]:not('.parentcheckbox')").not(':checked').length < 1) {
            $(this).closest("div").find(".parentcheckbox").attr('checked', true);
         } else {
            $(this).closest("div").find(".parentcheckbox").attr('checked', false);
        }
        });
    });

It works perfectly with the accompanying html:

HTML

<div class="accordian-group">
    <div>
    <input type="checkbox" class="parentcheckbox" value""/>
        <ul>
         <li> <input type="checkbox" value""/></li>
        <li> <input type="checkbox" value""/></li>
        <li> <input type="checkbox" value""/>
            <ul>
               <li> <input type="checkbox" value""/></li>
               <li> <input type="checkbox" value""/></li>
              <li> <input type="checkbox" value""/>
                    <ul>
                      <li> <input type="checkbox" value""/></li>
                    </ul>
                </li>
           </ul>
       </li>
       </ul>
    </div>
     <div>

It's supposed to toggle--when the parent checkbox is checked, it checks (or unchecks, depending on state) all the children. When a single child is unchecked, the parent (the "check all" box) is unchecked. And it is supposed to toggle indefinitely.

I can't find a way to modify the Rails-generated scaffold to work with the script. One variation (another code snippet from a different author) the script worked ONCE, then quit responding properly (it's supposed toggle continuously until submit).

I tried just copying the html directly into my _form.hml.erb file, and it worked ONCE, then quit toggling.

Also I got an error because I couldn't translate the erb (html.erb tags omitted because they caused the whole statement not to display in this forum for some reason) :

f.check_box :check_all

(or any of the other input statements) into html that would actually store the value in the db table. I don't know the right variable assignment (name=, input=, etc) to feed the db.

But what I'd really prefer is to learn how to translate the above html into html.erb that WORKS, and stores the table values.

Any ideas?