建立Request來做資料整理及檢查

app/Http/Controllers/CartController.php

@@ -4,6 +4,7 @@
 
 use App\Cart;
 use Illuminate\Http\Request;
+use App\Http\Requests\CartRequest;
 
 class CartController extends Controller
 {
@@ -33,8 +34,9 @@ public function create()
      * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\Response
      */
-    public function store(Request $request)
+    public function store(CartRequest $request)
     {
+
         Cart::create([
             'user_id'    => $request->user()->id,
             'product_id' => $request->product_id,

app/Http/Requests/CartRequest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Product;
+use Illuminate\Foundation\Http\FormRequest;
+
+class CartRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'product_id' => [
+                'required',
+                function ($attribute, $value, $fail) {
+                    if (!$product = Product::find($value)) {
+                        return $fail('該商品不存在');
+                    }
+                    if (!$product->on_sale) {
+                        return $fail('該商品未上架');
+                    }
+                },
+            ],
+            'amount'     => ['required', 'integer', 'min:1'],
+        ];
+    }
+
+    public function attributes()
+    {
+        return [
+            'amount' => '商品數量',
+        ];
+    }
+
+    public function messages()
+    {
+        return [
+            'required' => '請選擇商品',
+            'min'      => '「:attribute」至少要 :min 個',
+        ];
+    }
+
+}

resources/views/product/add2cart.blade.php

@@ -7,12 +7,23 @@
     .then(function () { // 請求成功時執行：
         swal('加入購物車成功', '', 'success');
     }, function (error) { // 請求失敗時執行：
+
+        console.log('error.response.status = ' + error.response.status);
+        if (error.response.status === 422) {
+            var html = '<div>';
+            _.each(error.response.data.errors, function (errors) {
+                _.each(errors, function (error) {
+                    html += error + '<br>';
+                })
+            });
+            html += '</div>';
+            swal({content: $(html)[0], icon: 'error'})
+        } else if(error.response.status === 500) {
+            swal('系統錯誤', '', 'error');
+        }
+
         @guest
             swal('請先登入', '', 'error');
         @endguest
-
-        @auth
-            swal('系統錯誤', '', 'error');
-        @endauth
     })
 });