opa stringmap iteration issues

type item = {string description, string url}

database mydb {
  stringmap(item) /items
}

/mydb/items["google"] = {description: "search the interwebs with google!", url: "http://google.com"}
/mydb/items["yahoo"]  = {description: "search the interwebs with yahoo!",  url: "http://yahoo.com"}

function render_item(item) {
<>
  <li>
    <h4>item</h4>
    <a href="/mydb/items[item]/url">{/mydb/items[item]/description}</a>
  </li>
</>
}

function render_index() {
<>
<ul>
{StringMap.iter(function(item) {render_item(item)}, /mydb/items)}
</ul>
</>
}

Server.start(Server.http, {title: "test", page: render_index})