diff --git a/src/CanBeBought.php b/src/CanBeBought.php
index 62a08a39..949c3a67 100644
--- a/src/CanBeBought.php
+++ b/src/CanBeBought.php
@@ -21,16 +21,16 @@ public function getBuyableIdentifier($options = null)
      */
     public function getBuyableDescription($options = null)
     {
-        if (property_exists($this, 'name')) {
-            return $this->name;
+        if (($name = $this->getAttribute('name'))) {
+            return $name;
         }
 
-        if (property_exists($this, 'title')) {
-            return $this->title;
+        if (($title = $this->getAttribute('title'))) {
+            return $ttle;
         }
 
-        if (property_exists($this, 'description')) {
-            return $this->description;
+        if (($description = $this->getAttribute('description'))) {
+            return $description;
         }
     }
 
@@ -41,8 +41,8 @@ public function getBuyableDescription($options = null)
      */
     public function getBuyablePrice($options = null)
     {
-        if (property_exists($this, 'price')) {
-            return $this->price;
+        if (($price = $this->getAttribute('price'))) {
+            return $price;
         }
     }
 
@@ -53,8 +53,8 @@ public function getBuyablePrice($options = null)
      */
     public function getBuyableWeight($options = null)
     {
-        if (property_exists($this, 'weight')) {
-            return $this->weight;
+        if (($weight = $this->getAttribute('weight'))) {
+            return $weight;
         }
 
         return 0;
diff --git a/tests/CartTest.php b/tests/CartTest.php
index ddb00fb5..ced58798 100644
--- a/tests/CartTest.php
+++ b/tests/CartTest.php
@@ -82,9 +82,15 @@ public function it_can_have_multiple_instances()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'First item'));
+        $cart->add(new BuyableProduct([
+            'id'   => 1,
+            'name' => 'First item',
+        ]));
 
-        $cart->instance('wishlist')->add(new BuyableProduct(2, 'Second item'));
+        $cart->instance('wishlist')->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Second item',
+        ]));
 
         $this->assertItemsInCart(1, $cart->instance(Cart::DEFAULT_INSTANCE));
         $this->assertItemsInCart(1, $cart->instance('wishlist'));
@@ -126,7 +132,11 @@ public function it_can_add_multiple_buyable_items_at_once()
 
         $cart = $this->getCart();
 
-        $cart->add([new BuyableProduct(1), new BuyableProduct(2)]);
+        $cart->add([new BuyableProduct([
+            'id' => 1,
+        ]), new BuyableProduct([
+            'id' => 2,
+        ])]);
 
         $this->assertEquals(2, $cart->count());
 
@@ -140,7 +150,11 @@ public function it_will_return_an_array_of_cartitems_when_you_add_multiple_items
 
         $cart = $this->getCart();
 
-        $cartItems = $cart->add([new BuyableProduct(1), new BuyableProduct(2)]);
+        $cartItems = $cart->add([new BuyableProduct([
+            'id' => 1,
+        ]), new BuyableProduct([
+            'id' => 2,
+        ])]);
 
         $this->assertTrue(is_array($cartItems));
         $this->assertCount(2, $cartItems);
@@ -332,9 +346,14 @@ public function it_can_update_an_existing_item_in_the_cart_from_a_buyable()
 
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct());
+        $cart->add(new BuyableProductTrait([
+            'description' => 'Description',
+        ]));
 
-        $cart->update('027c91341fd5cf4d2579b49c4b6a90da', new BuyableProduct(1, 'Different description'));
+        $cart->update('027c91341fd5cf4d2579b49c4b6a90da', new BuyableProductTrait([
+            'name'        => '',
+            'description' => 'Different description',
+        ]));
 
         $this->assertItemsInCart(1, $cart);
         $this->assertEquals('Different description', $cart->get('027c91341fd5cf4d2579b49c4b6a90da')->name);
@@ -349,7 +368,9 @@ public function it_can_update_an_existing_item_in_the_cart_from_an_array()
 
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct());
+        $cart->add(new BuyableProductTrait([
+            'description' => 'Description',
+        ]));
 
         $cart->update('027c91341fd5cf4d2579b49c4b6a90da', ['name' => 'Different description']);
 
@@ -370,7 +391,9 @@ public function it_will_throw_an_exception_if_a_rowid_was_not_found()
 
         $cart->add(new BuyableProduct());
 
-        $cart->update('none-existing-rowid', new BuyableProduct(1, 'Different description'));
+        $cart->update('none-existing-rowid', new BuyableProduct([
+            'description' => 'Different description',
+        ]));
     }
 
     /** @test */
@@ -484,8 +507,10 @@ public function it_can_get_the_content_of_the_cart()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1));
-        $cart->add(new BuyableProduct(2));
+        $cart->add(new BuyableProduct());
+        $cart->add(new BuyableProduct([
+            'id' => 2,
+        ]));
 
         $content = $cart->content();
 
@@ -509,8 +534,10 @@ public function it_will_include_the_tax_and_subtotal_when_converted_to_an_array(
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1));
-        $cart->add(new BuyableProduct(2));
+        $cart->add(new BuyableProduct());
+        $cart->add(new BuyableProduct([
+            'id' => 2,
+        ]));
 
         $content = $cart->content();
 
@@ -562,8 +589,14 @@ public function it_can_get_the_total_price_of_the_cart_content()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'First item', 10.00));
-        $cart->add(new BuyableProduct(2, 'Second item', 25.00), 2);
+        $cart->add(new BuyableProduct([
+            'name' => 'First item',
+        ]));
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'name'  => 'Second item',
+            'price' => 25.00,
+        ]), 2);
 
         $this->assertItemsInCart(3, $cart);
         $this->assertEquals(60.00, $cart->subtotal());
@@ -574,8 +607,15 @@ public function it_can_return_a_formatted_total()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'First item', 1000.00));
-        $cart->add(new BuyableProduct(2, 'Second item', 2500.00), 2);
+        $cart->add(new BuyableProduct([
+            'name'  => 'First item',
+            'price' => 1000.00,
+        ]));
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'name'  => 'Second item',
+            'price' => 2500.00,
+        ]), 2);
 
         $this->assertItemsInCart(3, $cart);
         $this->assertEquals('6.000,00', $cart->subtotal(2, ',', '.'));
@@ -586,8 +626,13 @@ public function it_can_search_the_cart_for_a_specific_item()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some item'));
-        $cart->add(new BuyableProduct(2, 'Another item'));
+        $cart->add(new BuyableProduct([
+            'name' => 'Some item',
+        ]));
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Another item',
+        ]));
 
         $cartItem = $cart->search(function ($cartItem, $rowId) {
             return $cartItem->name == 'Some item';
@@ -604,9 +649,17 @@ public function it_can_search_the_cart_for_multiple_items()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some item'));
-        $cart->add(new BuyableProduct(2, 'Some item'));
-        $cart->add(new BuyableProduct(3, 'Another item'));
+        $cart->add(new BuyableProduct([
+            'name' => 'Some item',
+        ]));
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Some item',
+        ]));
+        $cart->add(new BuyableProduct([
+            'id'   => 3,
+            'name' => 'Another item',
+        ]));
 
         $cartItem = $cart->search(function ($cartItem, $rowId) {
             return $cartItem->name == 'Some item';
@@ -620,8 +673,13 @@ public function it_can_search_the_cart_for_a_specific_item_with_options()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some item'), 1, ['color' => 'red']);
-        $cart->add(new BuyableProduct(2, 'Another item'), 1, ['color' => 'blue']);
+        $cart->add(new BuyableProduct([
+            'name' => 'Some item',
+        ]), 1, ['color' => 'red']);
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Another item',
+        ]), 1, ['color' => 'blue']);
 
         $cartItem = $cart->search(function ($cartItem, $rowId) {
             return $cartItem->options->color == 'red';
@@ -694,7 +752,10 @@ public function it_can_calculate_the_subtotal_of_a_cart_item()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 9.99), 3);
+        $cart->add(new BuyableProduct([
+            'name'  => 'Some title',
+            'price' => 9.99,
+        ]), 3);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -706,7 +767,10 @@ public function it_can_return_a_formatted_subtotal()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 500), 3);
+        $cart->add(new BuyableProduct([
+            'name'  => 'Some title',
+            'price' => 500,
+        ]), 3);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -718,7 +782,9 @@ public function it_can_calculate_tax_based_on_the_default_tax_rate_in_the_config
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Some title',
+        ]), 1);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -730,7 +796,9 @@ public function it_can_calculate_tax_based_on_the_specified_tax()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Some title',
+        ]), 1);
 
         $cart->setTax('027c91341fd5cf4d2579b49c4b6a90da', 19);
 
@@ -744,7 +812,10 @@ public function it_can_return_the_calculated_tax_formatted()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 10000.00), 1);
+        $cart->add(new BuyableProduct([
+            'name'  => 'Some title',
+            'price' => 10000.00,
+        ]), 1);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -756,8 +827,14 @@ public function it_can_calculate_the_total_tax_for_all_cart_items()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 10.00), 1);
-        $cart->add(new BuyableProduct(2, 'Some title', 20.00), 2);
+        $cart->add(new BuyableProduct([
+            'name' => 'Some title',
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'name'  => 'Some title',
+            'price' => 20.00,
+        ]), 2);
 
         $this->assertEquals(10.50, $cart->tax);
     }
@@ -767,8 +844,15 @@ public function it_can_return_formatted_total_tax()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 1000.00), 1);
-        $cart->add(new BuyableProduct(2, 'Some title', 2000.00), 2);
+        $cart->add(new BuyableProduct([
+            'name'  => 'Some title',
+            'price' => 1000.00,
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'name'  => 'Some title',
+            'price' => 2000.00,
+        ]), 2);
 
         $this->assertEquals('1.050,00', $cart->tax(2, ',', '.'));
     }
@@ -778,7 +862,9 @@ public function it_can_access_tax_as_percentage()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Some title',
+        ]), 1);
 
         $cart->setTax('027c91341fd5cf4d2579b49c4b6a90da', 19);
 
@@ -792,8 +878,11 @@ public function it_can_return_the_subtotal()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 10.00), 1);
-        $cart->add(new BuyableProduct(2, 'Some title', 20.00), 2);
+        $cart->add(new BuyableProduct(), 1);
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'price' => 20.00,
+        ]), 2);
 
         $this->assertEquals(50.00, $cart->subtotal);
     }
@@ -803,8 +892,13 @@ public function it_can_return_formatted_subtotal()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 1000.00), 1);
-        $cart->add(new BuyableProduct(2, 'Some title', 2000.00), 2);
+        $cart->add(new BuyableProduct([
+            'price' => 1000.00,
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'price' => 2000.00,
+        ]), 2);
 
         $this->assertEquals('5000,00', $cart->subtotal(2, ',', ''));
     }
@@ -816,8 +910,13 @@ public function it_can_return_cart_formated_numbers_by_config_values()
 
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Some title', 1000.00), 1);
-        $cart->add(new BuyableProduct(2, 'Some title', 2000.00), 2);
+        $cart->add(new BuyableProduct([
+            'price' => 1000.00,
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'price' => 2000.00,
+        ]), 2);
 
         $this->assertEquals('5000,00', $cart->subtotal());
         $this->assertEquals('1050,00', $cart->tax());
@@ -835,7 +934,9 @@ public function it_can_return_cartItem_formated_numbers_by_config_values()
 
         $cart = $this->getCartDiscount(50);
 
-        $cart->add(new BuyableProduct(1, 'Some title', 2000.00), 2);
+        $cart->add(new BuyableProduct([
+            'price' => 2000.00,
+        ]), 2);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -988,7 +1089,9 @@ public function it_can_calculate_all_values()
     {
         $cart = $this->getCartDiscount(50);
 
-        $cart->add(new BuyableProduct(1, 'First item', 10.00), 2);
+        $cart->add(new BuyableProduct([
+            'name' => 'First item',
+        ]), 2);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -1009,7 +1112,9 @@ public function it_can_calculate_all_values()
     public function it_can_calculate_all_values_after_updating_from_array()
     {
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'First item', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'First item',
+        ]), 1);
 
         $cart->update('027c91341fd5cf4d2579b49c4b6a90da', ['qty' => 2]);
 
@@ -1032,9 +1137,14 @@ public function it_can_calculate_all_values_after_updating_from_array()
     public function it_can_calculate_all_values_after_updating_from_buyable()
     {
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'First item', 5.00), 2);
+        $cart->add(new BuyableProduct([
+            'name'  => 'First item',
+            'price' => 5.00,
+        ]), 2);
 
-        $cart->update('027c91341fd5cf4d2579b49c4b6a90da', new BuyableProduct(1, 'First item', 10.00));
+        $cart->update('027c91341fd5cf4d2579b49c4b6a90da', new BuyableProduct([
+            'name' => 'First item',
+        ]));
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -1070,7 +1180,9 @@ public function can_change_tax_globally()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Item', 10.00), 2);
+        $cart->add(new BuyableProduct([
+            'name' => 'Item',
+        ]), 2);
 
         $cart->setGlobalTax(0);
 
@@ -1084,7 +1196,9 @@ public function can_change_discount_globally()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Item', 10.00), 2);
+        $cart->add(new BuyableProduct([
+            'name' => 'Item',
+        ]), 2);
 
         $cart->setGlobalTax(0);
         $cart->setGlobalDiscount(50);
@@ -1099,7 +1213,10 @@ public function cart_has_no_rounding_errors()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'Item', 10.004), 2);
+        $cart->add(new BuyableProduct([
+            'name'  => 'Item',
+            'price' => 10.004,
+        ]), 2);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -1116,8 +1233,13 @@ public function it_can_merge_multiple_carts()
         Event::fake();
 
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'Item', 10.00), 1);
-        $cart->add(new BuyableProduct(2, 'Item 2', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Item',
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Item 2',
+        ]), 1);
         $cart->store('test');
 
         $cart2 = $this->getCart();
@@ -1150,8 +1272,13 @@ public function it_cant_merge_non_existing_cart()
         ]);
         Event::fake();
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'Item', 10.00), 1);
-        $cart->add(new BuyableProduct(2, 'Item 2', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Item',
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Item 2',
+        ]), 1);
         $this->assertEquals(false, $cart->merge('doesNotExist'));
         $this->assertEquals(2, $cart->countItems());
     }
@@ -1160,7 +1287,9 @@ public function it_cant_merge_non_existing_cart()
     public function cart_can_calculate_all_values()
     {
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'First item', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'First item',
+        ]), 1);
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
         $cart->setTax('027c91341fd5cf4d2579b49c4b6a90da', 19);
         $this->assertEquals('10.00', $cart->initial(2));
@@ -1179,7 +1308,9 @@ public function cart_can_calculate_all_values()
     public function can_access_cart_item_propertys()
     {
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'First item', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'First item',
+        ]), 1);
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
         $this->assertEquals(50, $cartItem->discountRate);
     }
@@ -1188,7 +1319,9 @@ public function can_access_cart_item_propertys()
     public function cant_access_non_existant_propertys()
     {
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'First item', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'First item',
+        ]), 1);
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
         $this->assertEquals(null, $cartItem->doesNotExist);
         $this->assertEquals(null, $cart->doesNotExist);
@@ -1198,7 +1331,9 @@ public function cant_access_non_existant_propertys()
     public function can_set_cart_item_discount()
     {
         $cart = $this->getCart();
-        $cart->add(new BuyableProduct(1, 'First item', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'First item',
+        ]), 1);
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
         $cart->setDiscount('027c91341fd5cf4d2579b49c4b6a90da', 50);
         $this->assertEquals(50, $cartItem->discountRate);
@@ -1208,7 +1343,10 @@ public function can_set_cart_item_discount()
     public function can_set_cart_item_weight_and_calculate_total_weight()
     {
         $cart = $this->getCart();
-        $cart->add(new BuyableProduct(1, 'First item', 10.00, 250), 2);
+        $cart->add(new BuyableProduct([
+            'name'   => 'First item',
+            'weight' => 250,
+        ]), 2);
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
         $cart->setDiscount('027c91341fd5cf4d2579b49c4b6a90da', 50);
         $this->assertEquals('500.00', $cart->weight(2));
@@ -1232,7 +1370,10 @@ public function cart_can_create_and_restore_from_instance_identifier()
         $cart->instance($identifier);
         $this->assertEquals('User1', $cart->currentInstance());
 
-        $cart->add(new BuyableProduct(1, 'First item', 10.00, 250), 2);
+        $cart->add(new BuyableProduct([
+            'name'   => 'First item',
+            'weight' => 250,
+        ]), 2);
         $this->assertItemsInCart(2, $cart);
 
         $cart->store($identifier);
@@ -1248,7 +1389,9 @@ public function cart_can_create_items_from_models_using_the_canbebought_trait()
     {
         $cart = $this->getCartDiscount(50);
 
-        $cart->add(new BuyableProductTrait(1, 'First item', 10.00), 2);
+        $cart->add(new BuyableProductTrait([
+            'name' => 'First item',
+        ]), 2);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -1271,7 +1414,9 @@ public function it_does_calculate_correct_results_with_rational_qtys()
         // https://github.com/Crinsane/LaravelShoppingcart/issues/544
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProductTrait(1, 'First item', 10.00), 0.5);
+        $cart->add(new BuyableProductTrait([
+            'name' => 'First item',
+        ]), 0.5);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -1304,8 +1449,13 @@ public function it_can_merge_without_dispatching_add_events()
         ]);
 
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'Item', 10.00), 1);
-        $cart->add(new BuyableProduct(2, 'Item 2', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Item',
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Item 2',
+        ]), 1);
         $cart->store('test');
 
         Event::fakeFor(function () {
@@ -1334,8 +1484,13 @@ public function it_can_merge_dispatching_add_events()
         ]);
 
         $cart = $this->getCartDiscount(50);
-        $cart->add(new BuyableProduct(1, 'Item', 10.00), 1);
-        $cart->add(new BuyableProduct(2, 'Item 2', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Item',
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Item 2',
+        ]), 1);
         $cart->store('test');
 
         Event::fakeFor(function () {
@@ -1362,9 +1517,20 @@ public function it_use_correctly_rounded_values_for_totals_and_cart_summary()
 
         $cart = $this->getCartDiscount(6);
 
-        $cartItem = $cart->add(new BuyableProduct(1, 'First item', 0.18929), 1000);
-        $cart->add(new BuyableProduct(2, 'Second item', 4.41632), 5);
-        $cart->add(new BuyableProduct(3, 'Third item', 0.37995), 25);
+        $cartItem = $cart->add(new BuyableProduct([
+            'name'  => 'First item',
+            'price' => 0.18929,
+        ]), 1000);
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'name'  => 'Second item',
+            'price' => 4.41632,
+        ]), 5);
+        $cart->add(new BuyableProduct([
+            'id'    => 3,
+            'name'  => 'Third item',
+            'price' => 0.37995,
+        ]), 25);
 
         $cart->setGlobalTax(22);
 
@@ -1381,7 +1547,10 @@ public function it_use_gross_price_as_base_price()
         $cart = $this->getCartDiscount(0);
         config(['cart.calculator' => GrossPrice::class]);
 
-        $cartItem = $cart->add(new BuyableProduct(1, 'First item', 100), 2);
+        $cartItem = $cart->add(new BuyableProduct([
+            'name'  => 'First item',
+            'price' => 100,
+        ]), 2);
 
         $cart->setGlobalTax(22);
 
@@ -1397,9 +1566,20 @@ public function it_use_gross_price_and_it_use_correctly_rounded_values_for_total
 
         $cart = $this->getCartDiscount(6);
 
-        $cartItem = $cart->add(new BuyableProduct(1, 'First item', 0.23093), 1000);
-        $cart->add(new BuyableProduct(2, 'Second item', 5.38791), 5);
-        $cart->add(new BuyableProduct(3, 'Third item', 0.46354), 25);
+        $cartItem = $cart->add(new BuyableProduct([
+            'name'  => 'First item',
+            'price' => 0.23093,
+        ]), 1000);
+        $cart->add(new BuyableProduct([
+            'id'    => 2,
+            'name'  => 'Second item',
+            'price' => 5.38791,
+        ]), 5);
+        $cart->add(new BuyableProduct([
+            'id'    => 3,
+            'name'  => 'Third item',
+            'price' => 0.46354,
+        ]), 25);
 
         $cart->setGlobalTax(22);
 
@@ -1492,7 +1672,10 @@ public function it_can_calculate_the_total_price_of_the_items_in_cart()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'first item', $price = 1000), $qty = 5);
+        $cart->add(new BuyableProduct([
+            'name'  => 'first item',
+            'price' => 1000,
+        ]), $qty = 5);
         $this->assertEquals(5000, $cart->priceTotalFloat());
     }
 
@@ -1501,7 +1684,10 @@ public function it_can_format_the_total_price_of_the_items_in_cart()
     {
         $cart = $this->getCart();
 
-        $cart->add(new BuyableProduct(1, 'first item', 1000), 5);
+        $cart->add(new BuyableProduct([
+            'name'  => 'first item',
+            'price' => 1000,
+        ]), 5);
         $this->assertEquals('5,000.00', $cart->priceTotal());
         $this->assertEquals('5,000.0000', $cart->priceTotal(4, '.', ','));
     }
@@ -1516,8 +1702,13 @@ public function it_can_erase_saved_cart_from_the_database()
         Event::fake();
 
         $cart = $this->getCart();
-        $cart->add(new BuyableProduct(1, 'Item', 10.00), 1);
-        $cart->add(new BuyableProduct(2, 'Item 2', 10.00), 1);
+        $cart->add(new BuyableProduct([
+            'name' => 'Item',
+        ]), 1);
+        $cart->add(new BuyableProduct([
+            'id'   => 2,
+            'name' => 'Item 2',
+        ]), 1);
         $cart->store($identifier = 'test');
         $cart->erase($identifier);
         Event::assertDispatched('cart.erased');
diff --git a/tests/Fixtures/BuyableProduct.php b/tests/Fixtures/BuyableProduct.php
index 7ef6e5d2..be0dc7cf 100644
--- a/tests/Fixtures/BuyableProduct.php
+++ b/tests/Fixtures/BuyableProduct.php
@@ -3,43 +3,30 @@
 namespace Gloudemans\Tests\Shoppingcart\Fixtures;
 
 use Gloudemans\Shoppingcart\Contracts\Buyable;
+use Illuminate\Database\Eloquent\Model;
 
-class BuyableProduct implements Buyable
+class BuyableProduct extends Model implements Buyable
 {
     /**
-     * @var int|string
-     */
-    private $id;
-
-    /**
-     * @var string
-     */
-    private $name;
-
-    /**
-     * @var float
-     */
-    private $price;
-
-    /**
-     * @var float
-     */
-    private $weight;
-
-    /**
-     * BuyableProduct constructor.
+     * The attributes that are mass assignable.
      *
-     * @param int|string $id
-     * @param string     $name
-     * @param float      $price
+     * @var array
      */
-    public function __construct($id = 1, $name = 'Item name', $price = 10.00, $weight = 0)
-    {
-        $this->id = $id;
-        $this->name = $name;
-        $this->price = $price;
-        $this->weight = $weight;
-    }
+    protected $fillable = [
+        'id',
+        'name',
+        'title',
+        'description',
+        'price',
+        'weight',
+    ];
+
+    protected $attributes = [
+        'id'     => 1,
+        'name'   => 'Item name',
+        'price'  => 10.00,
+        'weight' => 0,
+    ];
 
     /**
      * Get the identifier of the Buyable item.
diff --git a/tests/Fixtures/BuyableProductTrait.php b/tests/Fixtures/BuyableProductTrait.php
index 7d0c9884..29e39f31 100644
--- a/tests/Fixtures/BuyableProductTrait.php
+++ b/tests/Fixtures/BuyableProductTrait.php
@@ -3,43 +3,30 @@
 namespace Gloudemans\Tests\Shoppingcart\Fixtures;
 
 use Gloudemans\Shoppingcart\Contracts\Buyable;
+use Illuminate\Database\Eloquent\Model;
 
-class BuyableProductTrait implements Buyable
+class BuyableProductTrait extends Model implements Buyable
 {
     use \Gloudemans\Shoppingcart\CanBeBought;
 
     /**
-     * @var int|string
-     */
-    private $id;
-
-    /**
-     * @var string
-     */
-    private $name;
-
-    /**
-     * @var float
-     */
-    private $price;
-
-    /**
-     * @var float
-     */
-    private $weight;
-
-    /**
-     * BuyableProduct constructor.
+     * The attributes that are mass assignable.
      *
-     * @param int|string $id
-     * @param string     $name
-     * @param float      $price
+     * @var array
      */
-    public function __construct($id = 1, $name = 'Item name', $price = 10.00, $weight = 0)
-    {
-        $this->id = $id;
-        $this->name = $name;
-        $this->price = $price;
-        $this->weight = $weight;
-    }
+    protected $fillable = [
+        'id',
+        'name',
+        'title',
+        'description',
+        'price',
+        'weight',
+    ];
+
+    protected $attributes = [
+        'id'     => 1,
+        'name'   => 'Item name',
+        'price'  => 10.00,
+        'weight' => 0,
+    ];
 }