/**
* Check if this coupon can be applied when other coupons had previously
* been applied.
*
* @param CartInterface $cart Cart
* @param CouponInterface $coupon Coupon
*
* @throws CouponNotStackableException Coupon is not stackable
*/
public function validateStackableCoupon(CartInterface $cart, CouponInterface $coupon)
{
$cartCoupons = $this->cartCouponRepository->findBy(['cart' => $cart]);
/**
* If there are no previously applied coupons we can skip the check.
*/
if (0 == count($cartCoupons)) {
return;
}
$appliedCouponsCanBeStacked = array_reduce($cartCoupons, function ($previousCouponsAreStackable, CartCouponInterface $cartCoupon) {
return $previousCouponsAreStackable && $cartCoupon->getCoupon()->getStackable();
}, true);
/**
* Checked coupon can be stackable and everything that was
* previously applied is also stackable.
*/
if ($coupon->getStackable() && $appliedCouponsCanBeStacked) {
return;
}
throw new CouponNotStackableException();
}
