feature: endpoint to favorite product

.gitignore

@@ -38,6 +38,8 @@ yarn-error.log
 testem.log
 /typings
 __screenshots__/
+*.cache
+.php-cs-fixer.dist.php
 
 # System files
 .DS_Store

backend/app/Http/Controllers/FavouriteProductController.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Resources\FavouriteProductResource;
+use App\Models\FavouriteProduct;
+use App\Models\Product;
+use App\Models\User;
+use Illuminate\Http\Request;
+
+class FavouriteProductController extends Controller
+{
+    public function index()
+    {
+        return FavouriteProductResource::collection(FavouriteProduct::all());
+    }
+
+    public function toggle(Request $request, Product $product)
+    {
+        /**
+         * @var User $user
+         */
+        $user = $request->user();
+
+        $changes = $user->favoriteProducts()->toggle($product);
+
+        // If changes has any item, that means a product has been attached.
+        $isFavorite = count($changes['attached']) > 0;
+
+        return response()->json([
+            'message' => $isFavorite ? 'Product added to favorites' : 'Product removed from favorites',
+            'isFavorite' => $isFavorite,
+        ]);
+    }
+}

backend/app/Http/Resources/FavouriteProductResource.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Models\FavouriteProduct;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/** @mixin FavouriteProduct */
+class FavouriteProductResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+
+            'user_id' => $this->user_id,
+            'product_id' => $this->product_id,
+        ];
+    }
+}

backend/app/Models/User.php

@@ -11,7 +11,9 @@
 class User extends Authenticatable
 {
     /** @use HasFactory<\Database\Factories\UserFactory> */
-    use HasFactory, Notifiable;
+    use HasFactory;
+
+    use Notifiable;
 
     /**
      * The attributes that are mass assignable.
@@ -50,4 +52,14 @@ protected function casts(): array
             'role' => UserRoles::class,
         ];
     }
+
+    public function favoriteProducts()
+    {
+        return $this->belongsToMany(Product::class, 'favorite_products', 'user_id', 'product_id');
+    }
+
+    public function hasFavorited(Product $product): bool
+    {
+        return $this->favoriteProducts()->where('product_id', $product->id)->exists();
+    }
 }

backend/database/migrations/2026_03_02_133303_create_favourite_products_table.php

@@ -0,0 +1,26 @@
+<?php
+
+use App\Models\Product;
+use App\Models\User;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('favorite_products', function (Blueprint $table) {
+            $table->id();
+            $table->foreignIdFor(User::class);
+            $table->foreignIdFor(Product::class);
+            $table->timestamps();
+            $table->unique(['user_id', 'product_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('favorite_products');
+    }
+};

backend/routes/api.php

@@ -1,6 +1,7 @@
 <?php
 
 use App\Http\Controllers\AuthenticatedUserController;
+use App\Http\Controllers\FavouriteProductController;
 use App\Http\Controllers\ProductCategoryController;
 use App\Http\Controllers\ProductController;
 use App\Http\Controllers\ProductImagesController;
@@ -15,6 +16,9 @@
     Route::get('/user', [AuthenticatedUserController::class, 'show']);
     Route::post('/logout', [AuthenticatedUserController::class, 'destroy']);
     Route::post('/upload/images', action: [ProductImagesController::class, 'store']);
+
+    // Favorites
+    Route::post('/products/{product}/favorite', [FavouriteProductController::class, 'toggle']);
 });
 Route::get('/categories', [ProductCategoryController::class, 'index']);
 Route::apiResource('products', ProductController::class);