Caching dynamic url view

I am trying to implement full view caching for a specific method in a
controller.

First I realized that if you set $this->layout = false; then caching
will NOT happen. I have no idea why this occurs. I am not sure if this
is a bug as I had a hard time debugging out how the cache works.

Once, I turned that off I was able to get my view to cache by adding
var $cacheAction = "1 hour";

Since I don't want to cache everything in the view I need to cache
just specific methods. The URL that I would like to cache looks like
this:
/posts/badge/23/size:180x150
where 23 is the post ID and size is a named parameter (there are 2
variations of size).

So my question is what is the proper (if any) match to place in
cacheAction to cache all posts/badges/* Here are some examples that I
have tried:

var $cacheAction = array(
'badge/*' => '+1 hour',
'posts/badge/23/size:180x150' => '1 hour',
'badge/23/size:180x150' => '1 hour',
'posts/badge/:id/:size' => '1 hour',
'badge/:id/:size' => '1 hour',
);

None of these seem to match (or at least do not cache for some
reason). I do need to cache posts/badge/*/size:* and trap each of the
parameters being passed.

Again, if I set $cacheAction = "1 hour"; then the cache file is
created (the file tmp/cache/views/posts_badge_23_size_180x150.php is
created)

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