php.activerecord

Subject: Problem with retrieving defined relationships

Hi,

I am having some troubles with relationships. For example, I have two tables, product_types and products, and the following Product_type model:

class Product_type extends ActiveRecord\Model {
    static $has_many = array(array("products"));
}

When I do this:

$object = Product_type::find(1);
 print_r($object);

I get this:

Product_type Object
(
    [errors] => 
    [attributes:ActiveRecord\Model:private] => Array
        (
            [id] => 1
            [name] => mp3
        )

[__dirty:ActiveRecord\Model:private] => Array
        (
        )

[__readonly:ActiveRecord\Model:private] => 
    [__relationships:ActiveRecord\Model:private] => Array
        (
        )

[__new_record:ActiveRecord\Model:private] => 
)

Note that the __relationships array is empty. Also retrieving the table relationship by

$table = new ActiveRecord\Table("Product_type");
 print_r($table->get_relationship('products'));

does not show anything
What am I doing wrong?