diff --git a/src/CartItem.php b/src/CartItem.php
index 2a1ea36..4283c2e 100644
--- a/src/CartItem.php
+++ b/src/CartItem.php
@@ -140,15 +140,23 @@ public function updateFromArray(array $attributes)
     }
 
     /**
-     * Associate the cart item with the given model.
+     * Associate the cart item with a given model or something else.
      *
-     * @param  mixed  $model
-     * @return CartItem
+     * @param $item
+     * @param  bool  $is_model
+     * @return $this
      */
-    public function associate($model): CartItem
+    public function associate($item, bool $is_model = true): CartItem
     {
-        $this->associatedModel = is_string($model) ? $model : get_class($model);
-        $this->model = $model;
+        if ($is_model) {
+            $this->associatedModel = is_string($item) ? $item : get_class($item);
+            $this->model = $item;
+
+            return $this;
+        }
+
+        $this->associatedModel = Arr::has($item, 'associatedModel') ? Arr::get($item, 'associatedModel') : null;
+        $this->model = Arr::has($item, 'modelId') ? Arr::get($item, 'modelId') : null;
 
         return $this;
     }
diff --git a/tests/CartItemTest.php b/tests/CartItemTest.php
index 5e81e15..4e85434 100644
--- a/tests/CartItemTest.php
+++ b/tests/CartItemTest.php
@@ -355,4 +355,30 @@ public function it_can_sum_discount()
 
         $this->assertTrue($cartItem->hasCoupons());
     }
+
+    /** @test */
+    public function it_can_associate_model_id()
+    {
+        $cartItem = new CartItem(
+            1,
+            'First Cart item',
+            'This is a simple description',
+            1,
+            100.00,
+            122.00,
+            '0',
+            '0',
+            22.00,
+            'https://ecommerce.test/images/item-name.png',
+            ['size' => 'XL', 'color' => 'red']
+        );
+
+        $cartItem->associate([
+            'associatedModel' => 'OfflineAgency\LaravelCart\Tests\Fixtures\ProductModel',
+            'modelId' => 'fake_id',
+        ], false);
+
+        $this->assertEquals('OfflineAgency\LaravelCart\Tests\Fixtures\ProductModel', $cartItem->associatedModel);
+        $this->assertEquals('fake_id', $cartItem->model);
+    }
 }