feature: add index endpoint for products

- implement DTO for product and modify productImageDTO.
- add products resources and collection.

backend/app/Data/ProductDTO.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Data;
+
+use App\Contracts\OutputDataTransferObject;
+use App\Models\Product;
+use App\Models\ProductImage;
+
+final readonly class ProductDTO implements OutputDataTransferObject
+{
+    /**
+     * @param  ProductImageDTO[]  $productImages
+     */
+    public function __construct(
+        public int $id,
+        public string $title,
+        public string $description,
+        public int $actualPrice,
+        public int $listPrice,
+        public ProductCategoryDTO $category,
+        public array $productImages,
+    ) {}
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(): array
+    {
+        return [
+            'id' => $this->id,
+            'title' => $this->title,
+            'description' => $this->description,
+            'actualPrice' => $this->actualPrice,
+            'listPrice' => $this->listPrice,
+            'category' => $this->category->toArray(),
+            'productImage' => array_map(fn (ProductImageDTO $productImage) => $productImage->toArray(),
+                $this->productImages),
+        ];
+    }
+
+    public static function fromModel(Product $product): self
+    {
+        return new self(
+            id: $product->id,
+            title: $product->title,
+            description: $product->description,
+            actualPrice: $product->actual_price,
+            listPrice: $product->list_price,
+            category: ProductCategoryDTO::fromModel($product->category),
+            productImages: $product->images->map(fn (ProductImage $productImage) => ProductImageDTO::fromModel($productImage))->all(),
+        );
+    }
+}

backend/app/Data/ProductImageDTO.php

@@ -3,6 +3,7 @@
 namespace App\Data;
 
 use App\Contracts\OutputDataTransferObject;
+use App\Models\ProductImage;
 
 final readonly class ProductImageDTO implements OutputDataTransferObject
 {
@@ -23,4 +24,13 @@ public function toArray(): array
             'productId' => $this->productId,
         ];
     }
+
+    public static function fromModel(ProductImage $productImage): self
+    {
+        return new self(
+            $productImage->id,
+            $productImage->path,
+            $productImage->product_id
+        );
+    }
 }

backend/app/Http/Controllers/ProductController.php

@@ -2,13 +2,21 @@
 
 namespace App\Http\Controllers;
 
+use App\Data\ProductDTO;
 use App\Http\Requests\CreateProductRequest;
+use App\Http\Resources\ProductResource;
 use App\Models\Product;
 use Illuminate\Http\Request;
 
 class ProductController extends Controller
 {
-    public function index() {}
+    public function index()
+    {
+        $paginator = Product::query()->with(['category:id,name,slug', 'images:id,path,product_id'])->paginate();
+        $paginatedDtos = $paginator->through(fn ($product) => ProductDTO::fromModel($product));
+
+        return ProductResource::collection($paginatedDtos);
+    }
 
     public function store(CreateProductRequest $request)
     {

backend/app/Http/Resources/ProductCollection.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\ResourceCollection;
+
+class ProductCollection extends ResourceCollection
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'data' => $this->collection,
+        ];
+    }
+}

backend/app/Http/Resources/ProductResource.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Http\Resources;
+
+use App\Data\ProductDTO;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @property ProductDTO $resource
+ */
+class ProductResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return $this->resource->toArray();
+    }
+}

backend/app/Models/Product.php

@@ -16,9 +16,9 @@ class Product extends Model
         'product_category_id',
     ];
 
-    public function productCategory(): BelongsTo
+    public function category(): BelongsTo
     {
-        return $this->belongsTo(ProductCategory::class);
+        return $this->belongsTo(ProductCategory::class, 'product_category_id');
     }
 
     public function images(): HasMany

backend/routes/api.php

@@ -15,6 +15,6 @@
     Route::get('/user', [AuthenticatedUserController::class, 'show']);
     Route::post('/logout', [AuthenticatedUserController::class, 'destroy']);
     Route::post('/upload/images', action: [ProductImagesController::class, 'store']);
-    Route::apiResource('products', ProductController::class);
 });
 Route::get('/categories', [ProductCategoryController::class, 'index']);
+Route::apiResource('products', ProductController::class);