Kohana ORM ordering - orm

Question

I'm using Kohana's ORM library, and I'm wondering if there is any way to select DB records in a particular predetermined sequence.
$products_ids = array('5', '6', '1', '33', '2');
$products = ORM::factory('Product')->where('state', '=', 1)
->and_where('id', 'IN', $products_ids)->find_all();
This orders result by primary key (id). So result records ordered like (1, 2, 5, 6, 33). How select records by order defined in $products_ids ('5', '6', '1', '33', '2')?
Thanks.

Answer 1

Yes this is possible.
$products = ORM::factory('Product')->where('state', '=', 1)
->and_where('id', 'IN', $products_ids)->order_by('product_id', 'desc')->find_all();
Note the added order_by() in the string above.
You can order your results now. It has more cool features like group_by().
Read the documentation and you will find more unexpected magic in ORM.

Answer 2

In MySQL you can have conditions in order by clause where if the condition match it gets treated as 1 and 0 on fails.
The code for the example would be:
$products_ids = array('5', '6', '1', '33', '2');
$products = ORM::factory('Product')->where('state', '=', 1)->and_where('id', 'IN', $products_ids);
foreach($products_ids as $product_id)
{
$products->order_by(DB::expr('id='.$product_id), 'desc');
}
$products = $products->find_all();
In MySQL it would look something like this:
SELECT * FROM products WHERE ... ORDER BY id=5 DESC, id=6 DESC, id=1 DESC, id=33 DESC, id=2 DESC;

Answer 3

I don't know why you wan do so stupid thing, but 2 answers you have. (For stric problem. But probably you don't show full background.
I propose 2 scenarios:
Products on page category - add column for order it to table.
Display shopping chart - order by order_item_id
BTW: ORM is comfortable, but slow, so if you nedd it only for display (read operation) better is using raw query. Here solution for ORM.
public function get_ordered(array $ids){
if(empty($ids))
return array();
$res = DB::select->from($this->_table_name)
->where($this->primary_key(),'IN',$ids)
->execute($this->_db)->as_array($this->primary_key());
$out = array();
foreach($ids AS $one){
if(isset($res[$one]))
$out[$one] = $res[$one];
}
return $out;
}