express+riak=rad.js

app.get("/users/:username/sites", function(req, res) {
  riak.add("sites")
      .map(predicates.findByPropertyValue, ["owner", req.params.username])
      .run(function(e, result, meta) {
        if (e) {
          res.fail("There was an error while getting sites for this user.", meta.statusCode);
          return;
        }

        res.ok(result, meta.statusCode);
      });
});