wip

src/Cart/Driver.php

@@ -3,6 +3,7 @@
 namespace Cone\Bazar\Cart;
 
 use Cone\Bazar\Bazar;
+use Cone\Bazar\Exceptions\CartException;
 use Cone\Bazar\Gateway\Response;
 use Cone\Bazar\Interfaces\Buyable;
 use Cone\Bazar\Models\Address;
@@ -88,6 +89,10 @@ public function getItem(string $id): ?Item
      */
     public function addItem(Buyable $buyable, float $quantity = 1, array $properties = []): Item
     {
+        if (! $buyable->buyable($this->getModel())) {
+            throw new CartException(sprintf('Unable to add [%s] item to the cart.', get_class($buyable)));
+        }
+
         $item = $buyable->toItem(
             $this->getModel(),
             ['quantity' => $quantity, 'properties' => $properties]

src/Exceptions/CartException.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Cone\Bazar\Exceptions;
+
+use Exception;
+
+class CartException extends Exception
+{
+    //
+}

src/Models/Cart.php

@@ -4,6 +4,8 @@
 
 use Cone\Bazar\Bazar;
 use Cone\Bazar\Database\Factories\CartFactory;
+use Cone\Bazar\Exceptions\CartException;
+use Cone\Bazar\Interfaces\Buyable;
 use Cone\Bazar\Interfaces\Models\Cart as Contract;
 use Cone\Bazar\Traits\Addressable;
 use Cone\Bazar\Traits\InteractsWithDiscounts;
@@ -189,6 +191,12 @@ public function scopeExpired(Builder $query): Builder
      */
     public function toOrder(): Order
     {
+        $this->lineItems->each(function (Buyable $buyable): void {
+            if (! $buyable->buyable($this->order)) {
+                throw new CartException(sprintf('Unable to add [%s] item to the order.', get_class($buyable)));
+            }
+        });
+
         $this->order->user()->associate($this->user)->save();
 
         if ($this->order_id !== $this->order->getKey()) {

src/Models/Product.php

@@ -91,6 +91,14 @@ public function variants(): HasMany
         return $this->hasMany(Variant::getProxiedClass());
     }
 
+    /**
+     * Determine whether the buyable object is available for the itemable instance.
+     */
+    public function buyable(Itemable $itemable): bool
+    {
+        return true;
+    }
+
     /**
      * Scope the query only to the models that are out of stock.
      */