Product Pagination Question

I have this index function

function index( $category_id = null ) {

if (!$category_id) {
$this->Product->recursive = 0;
//$this->set('products', $this->paginate());
$this->paginate = array(

'limit' => 2);

$products = $this->paginate('Product');

$this->set(compact('products'));
}

if ( !empty( $category_id ) ){

$this->paginate = array(
'conditions' => array(
'Product.category_id ' => $category_id),
'limit' => 2);

$products = $this->paginate('Product');

$this->set(compact('products'));

}
}

So I pass the category_id to paginate the category of items.
First page works fine /products/2 paginates the first page of the "2"
catergory_id of products.

Click next and I get products/index/page:2 the "2 category_id" get dropped
so its back to paginating all products. How can I keep the pagination going
here?

Thanks

Dave

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