Symfony Routing - Optional parameters

I'm creating a Symfony project that outputs JSON for consumption by an iPhone App.

I have a route set up:

notification_json:
  url: /notifications.json
  param: { module: notification, action: index, sf_format: json }

This currently lists all notifications (one of my models).

What I'd like to do is add some parameters to this, much like the Twitter API has 'since_id' - so if /notifications.json?since_id=3 was requested, only notifications with an ID higher than 3 would be shown.

I can't see me struggling with the action logic, but the routing for this kind of thing has me scratching my head a little!

Any help would be extremely appreciated.

Solution

If you don't specify any named parameters (eg :myparam) when defining a route in your routing.yml, then any parameters you add on when generating the route will be appended as normal GET variables. For example:

notification_json:
  url: /notifications.json
  param: { module: notification, action: index, sf_format: json }

used with:

<?php echo url_for("@notification_json?since_id=3"); ?>

will give you:

/notifications.json?since_id=3

If you add in named parameters into your route, then these will be substituted as normal, with any additional parameters tagged on the end as above, eg:

notification_json_test:
  url: /:param1/notifications.json
  param: { module: notification, action: index, sf_format: json }

used with:

<?php echo url_for("@notification_json?param1=foo&since_id=3"); ?>

will give you:

/foo/notifications.json?since_id=3