From 5bbec0ee2b6a24365560f2971dc9fa0e97296094 Mon Sep 17 00:00:00 2001
From: kusowl <kushal.saha@outlook.com>
Date: Tue, 10 Mar 2026 19:01:52 +0530
Subject: [PATCH] feature: update quantity and remove product from cart

add endpoint for update quantity of products (min:1, max:10)
add endpoint for removing product from cart
---
 .../Actions/RemoveProductFromCartAction.php   | 21 ++++++++++
 .../app/Actions/UpdateProductInCartAction.php | 34 +++++++++++++++
 .../app/Http/Controllers/CartController.php   | 42 ++++++++++++++++---
 .../Requests/RemoveProductFromCartRequest.php | 28 +++++++++++++
 .../Requests/UpdateProductInCartRequest.php   | 29 +++++++++++++
 backend/routes/api.php                        |  5 ++-
 6 files changed, 152 insertions(+), 7 deletions(-)
 create mode 100644 backend/app/Actions/RemoveProductFromCartAction.php
 create mode 100644 backend/app/Actions/UpdateProductInCartAction.php
 create mode 100644 backend/app/Http/Requests/RemoveProductFromCartRequest.php
 create mode 100644 backend/app/Http/Requests/UpdateProductInCartRequest.php

diff --git a/backend/app/Actions/RemoveProductFromCartAction.php b/backend/app/Actions/RemoveProductFromCartAction.php
new file mode 100644
index 0000000..b9ddceb
--- /dev/null
+++ b/backend/app/Actions/RemoveProductFromCartAction.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Actions;
+
+use App\Models\User;
+
+final readonly class RemoveProductFromCartAction
+{
+    public function __construct(private GetActiveUserCartAction $activeCartAction) {}
+
+    /**
+     * Execute the action.
+     */
+    public function execute(int $productId, User $user)
+    {
+        $cart = $user->carts()->active()->sole();
+        $cart->products()->detach($productId);
+
+        return $this->activeCartAction->execute($user);
+    }
+}
diff --git a/backend/app/Actions/UpdateProductInCartAction.php b/backend/app/Actions/UpdateProductInCartAction.php
new file mode 100644
index 0000000..9bb4d8f
--- /dev/null
+++ b/backend/app/Actions/UpdateProductInCartAction.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Actions;
+
+use App\Data\AddToCartDTO;
+use App\Data\CartDTO;
+use App\Models\User;
+use InvalidArgumentException;
+
+final readonly class UpdateProductInCartAction
+{
+    /**
+     * Execute the action.
+     *
+     * @throws InvalidArgumentException
+     */
+    public function execute(AddToCartDTO $cartData, User $user)
+    {
+        $cart = $user->carts()->active()->sole();
+
+        $productInCart = $cart->products()->find($cartData->productId);
+
+        throw_if($productInCart === null, new InvalidArgumentException('Product not found'));
+
+        $cart->products()->updateExistingPivot($cartData->productId, [
+            'quantity' => $cartData->quantity,
+        ]);
+
+        return CartDTO::fromModel($cart->load(['products' => function ($query) {
+            $query->withPivot('quantity', 'price');
+        }]));
+
+    }
+}
diff --git a/backend/app/Http/Controllers/CartController.php b/backend/app/Http/Controllers/CartController.php
index f54bfee..ffddc15 100644
--- a/backend/app/Http/Controllers/CartController.php
+++ b/backend/app/Http/Controllers/CartController.php
@@ -4,10 +4,13 @@
 
 use App\Actions\AddProductToCartAction;
 use App\Actions\GetActiveUserCartAction;
+use App\Actions\RemoveProductFromCartAction;
+use App\Actions\UpdateProductInCartAction;
 use App\Data\AddToCartDTO;
 use App\Http\Requests\AddProductToCartRequest;
+use App\Http\Requests\RemoveProductFromCartRequest;
+use App\Http\Requests\UpdateProductInCartRequest;
 use App\Http\Resources\CartResource;
-use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
 
 class CartController extends Controller
@@ -36,16 +39,45 @@ public function show(GetActiveUserCartAction $action)
     /**
      * Update the specified resource in storage.
      */
-    public function update(Request $request, string $id)
+    public function update(UpdateProductInCartRequest $request, UpdateProductInCartAction $action)
     {
-        //
+        $updateCartData = AddToCartDTO::fromRequest($request);
+        $cart = $action->execute($updateCartData, $request->user());
+
+        return new CartResource($cart);
     }
 
     /**
      * Remove the specified resource from storage.
      */
-    public function destroy(string $id)
+    public function destroy(RemoveProductFromCartRequest $request, RemoveProductFromCartAction $action)
     {
-        //
+        $user = $request->user();
+        try {
+            $cart = $action->execute($request->productId, $user);
+
+            return new CartResource($cart);
+        } catch (ModelNotFoundException $e) {
+
+            Log::error('No active cart found when removing a product from cart.', [
+                'user' => $user->id,
+                'error' => $e->getMessage(),
+            ]);
+
+            return response()->json([
+                'message' => 'No active cart found.',
+            ], 404);
+
+        } catch (MultipleRecordsFoundException $e) {
+            Log::error('Multiple active carts found for the user', [
+                'user' => $user->id,
+                'error' => $e->getMessage(),
+            ]);
+
+            return response()->json([
+                'message' => 'Multiple Active carts found.',
+            ], 409);
+        }
+
     }
 }
diff --git a/backend/app/Http/Requests/RemoveProductFromCartRequest.php b/backend/app/Http/Requests/RemoveProductFromCartRequest.php
new file mode 100644
index 0000000..d388f6d
--- /dev/null
+++ b/backend/app/Http/Requests/RemoveProductFromCartRequest.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class RemoveProductFromCartRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'productId' => ['required', 'exists:products,id'],
+        ];
+    }
+}
diff --git a/backend/app/Http/Requests/UpdateProductInCartRequest.php b/backend/app/Http/Requests/UpdateProductInCartRequest.php
new file mode 100644
index 0000000..adbc4d9
--- /dev/null
+++ b/backend/app/Http/Requests/UpdateProductInCartRequest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateProductInCartRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'productId' => ['required', 'exists:products,id'],
+            'quantity' => ['required', 'min:0', 'max:10'],
+        ];
+    }
+}
diff --git a/backend/routes/api.php b/backend/routes/api.php
index 5da74c3..c1dc546 100644
--- a/backend/routes/api.php
+++ b/backend/routes/api.php
@@ -21,8 +21,9 @@
     // Favorites
     Route::post('/products/{product}/favorite', [FavouriteProductController::class, 'toggle']);
 
-    Route::post('/cart', [CartController::class, 'store']);
-    Route::get('/cart', [CartController::class, 'show']);
+    Route::apiSingleton('/cart', CartController::class)
+        ->creatable()
+        ->destroyable();
 });
 Route::get('/categories', [ProductCategoryController::class, 'index']);
 Route::apiResource('products', ProductController::class);