From 503e489a423f1805d979799dd0566d3d541d20e0 Mon Sep 17 00:00:00 2001
From: Alec Ritson <hello@itsalec.co.uk>
Date: Tue, 30 Apr 2024 16:06:25 +0100
Subject: [PATCH] Handle cart line update validation (#1718)

---
 .../Validation/CartLine/CartLineQuantity.php  |  8 +++++
 .../CartLine/CartLineQuantityTest.php         | 29 +++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/packages/core/src/Validation/CartLine/CartLineQuantity.php b/packages/core/src/Validation/CartLine/CartLineQuantity.php
index 30a627a095..7c2d385e86 100644
--- a/packages/core/src/Validation/CartLine/CartLineQuantity.php
+++ b/packages/core/src/Validation/CartLine/CartLineQuantity.php
@@ -13,6 +13,14 @@ public function validate(): bool
     {
         $quantity = $this->parameters['quantity'] ?? 0;
         $purchasable = $this->parameters['purchasable'] ?? null;
+        $cartLineId = $this->parameters['cartLineId'] ?? null;
+        $cart = $this->parameters['cart'] ?? null;
+
+        if ($cartLineId && ! $purchasable && $cart) {
+            $purchasable = $cart->lines->first(
+                fn ($cartLine) => $cartLine->id == $cartLineId
+            )?->purchasable;
+        }
 
         if ($quantity < 1) {
             $this->fail(
diff --git a/tests/core/Unit/Validation/CartLine/CartLineQuantityTest.php b/tests/core/Unit/Validation/CartLine/CartLineQuantityTest.php
index 2dfc925de3..5c53d78b13 100644
--- a/tests/core/Unit/Validation/CartLine/CartLineQuantityTest.php
+++ b/tests/core/Unit/Validation/CartLine/CartLineQuantityTest.php
@@ -164,3 +164,32 @@
         'increment' => 14,
     ],
 ]);
+
+test('can validate from cart line id', function () {
+    $currency = Currency::factory()->create();
+
+    $cart = Cart::factory()->create([
+        'currency_id' => $currency->id,
+    ]);
+
+    $purchasable = \Lunar\Models\ProductVariant::factory()->create([
+        'quantity_increment' => 25,
+    ]);
+
+    $cart->lines()->create([
+        'purchasable_type' => \Lunar\Models\ProductVariant::class,
+        'purchasable_id' => $purchasable->id,
+        'quantity' => 50,
+    ]);
+
+    $validator = (new CartLineQuantity)->using(
+        cart: $cart,
+        purchasable: null,
+        cartLineId: $cart->lines()->first()->id,
+        quantity: 26,
+        meta: []
+    );
+
+    expect(fn () => $validator->validate())
+        ->toThrow(CartException::class);
+});