Add Cart model, resource and its API, Pivot table with Items.

Update Items model to have relationship with cart.

app/Http/Controllers/API/v2/CartController.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace App\Http\Controllers\API\v2;
+
+use App\Http\Requests\StoreCartRequest;
+use App\Http\Requests\UpdateCartRequest;
+use App\Http\Resources\API\v2\CartResource;
+use App\Models\Cart;
+
+class CartController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     */
+    public function index()
+    {
+        //
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     */
+    public function create()
+    {
+        //
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     */
+    public function store(StoreCartRequest $request)
+    {
+        //
+    }
+
+    /**
+     * Display the specified resource.
+     */
+    public function show(Cart $cart)
+    {
+        return new CartResource($cart);
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     */
+    public function edit(Cart $cart)
+    {
+        //
+    }
+
+    /**
+     * Update the specified resource in storage.
+     */
+    public function update(UpdateCartRequest $request, Cart $cart)
+    {
+        //
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     */
+    public function destroy(Cart $cart)
+    {
+        //
+    }
+}

app/Http/Requests/StoreCartRequest.php

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+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreCartRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return false;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array|string>
+     */
+    public function rules(): array
+    {
+        return [
+            //
+        ];
+    }
+}

app/Http/Requests/UpdateCartRequest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateCartRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return false;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array|string>
+     */
+    public function rules(): array
+    {
+        return [
+            //
+        ];
+    }
+}

app/Http/Resources/API/v2/CartCollection.php

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+<?php
+
+namespace App\Http\Resources\API\v2;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\ResourceCollection;
+
+class CartCollection extends ResourceCollection
+{
+    /**
+     * Transform the resource collection into an array.
+     *
+     * @return array<int|string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return parent::toArray($request);
+    }
+}

app/Http/Resources/API/v2/CartResource.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Resources\API\v2;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class CartResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        $city_name = $this->city->name;
+        $company_name = $this->company->name;
+        $items = $this->items;
+
+        return [
+            'id' => $this->id,
+            'cityName' => $city_name,
+            'companyName' => $company_name,
+            'item' => new ItemCollection($items),
+        ];
+    }
+}