/**
* Redeem this discount against the passed in cart/cart_item combo.
*/
protected function add_for_cart($cart, $cart_item = null)
{
$redemption = new DiscountRedemption();
$redemption->discount_id = $this->id;
$redemption->cart_id = $cart->id;
if ($cart_item) {
$redemption->cart_item_id = $cart_item->id;
}
$redemption->save();
return $redemption;
}
