商品加入购物车

app/Http/Controllers/CartController.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\AddCartRequest;
+use App\Models\CartItem;
+use Illuminate\Http\Request;
+
+class CartController extends Controller
+{
+    public function add(AddCartRequest $request)
+    {
+        $user   = $request->user();
+        $skuId  = $request->input('sku_id');
+        $amount = $request->input('amount');
+
+        // 从数据库中查询该商品是否已经在购物车中
+        if ($cart = $user->cartItems()->where('product_sku_id', $skuId)->first()) {
+
+            // 如果存在则直接叠加商品数量
+            $cart->update([
+                'amount' => $cart->amount + $amount,
+            ]);
+        } else {
+
+            // 否则创建一个新的购物车记录
+            $cart = new CartItem(['amount' => $amount]);
+            $cart->user()->associate($user);
+            $cart->productSku()->associate($skuId);
+            $cart->save();
+        }
+
+        return [];
+    }
+}

app/Http/Requests/AddCartRequest.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Models\ProductSku;
+
+class AddCartRequest extends Request
+{
+    public function rules()
+    {
+        return [
+            'sku_id' => [
+                'required',
+                function ($attribute, $value, $fail) {
+                    if (!$sku = ProductSku::find($value)) {
+                        return $fail('该商品不存在');
+                    }
+                    if (!$sku->product->on_sale) {
+                        return $fail('该商品未上架');
+                    }
+                    if ($sku->stock === 0) {
+                        return $fail('该商品已售完');
+                    }
+                    if ($this->input('amount') > 0 && $sku->stock < $this->input('amount')) {
+                        return $fail('该商品库存不足');
+                    }
+                },
+            ],
+            'amount' => ['required', 'integer', 'min:1'],
+        ];
+    }
+
+    public function attributes()
+    {
+        return [
+            'amount' => '商品数量'
+        ];
+    }
+
+    public function messages()
+    {
+        return [
+            'sku_id.required' => '请选择商品'
+        ];
+    }
+}

app/Models/CartItem.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class CartItem extends Model
+{
+    protected $fillable = ['amount'];
+    public $timestamps = false;
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function productSku()
+    {
+        return $this->belongsTo(ProductSku::class);
+    }
+}

app/Models/User.php

@@ -39,4 +39,9 @@ public function favoriteProducts()
             ->withTimestamps()
             ->orderBy('user_favorite_products.created_at', 'desc');
     }
+
+    public function cartItems()
+    {
+        return $this->hasMany(CartItem::class);
+    }
 }

database/migrations/2018_12_22_071404_create_cart_items_table.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateCartItemsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('cart_items', function (Blueprint $table) {
+            $table->increments('id');
+            $table->unsignedInteger('user_id');
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->unsignedInteger('product_sku_id');
+            $table->foreign('product_sku_id')->references('id')->on('product_skus')->onDelete('cascade');
+            $table->unsignedInteger('amount');
+        });
+    }
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('cart_items');
+    }
+}

resources/views/products/show.blade.php

@@ -110,6 +110,41 @@ class="btn sku-btn"
           });
       });
 
+      // 加入购物车按钮点击事件
+      $('.btn-add-to-cart').click(function () {
+
+        // 请求加入购物车接口
+        axios.post('{{ route('cart.add') }}', {
+          sku_id: $('label.active input[name=skus]').val(),
+          amount: $('.cart_amount input').val(),
+        })
+          .then(function () { // 请求成功执行此回调
+            swal('加入购物车成功', '', 'success');
+          }, function (error) { // 请求失败执行此回调
+            if (error.response.status === 401) {
+
+              // http 状态码为 401 代表用户未登陆
+              swal('请先登录', '', 'error');
+
+            } else if (error.response.status === 422) {
+
+              // http 状态码为 422 代表用户输入校验失败
+              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 {
+
+              // 其他情况应该是系统挂了
+              swal('系统错误', '', 'error');
+            }
+          })
+      });
+
     });
   </script>
 @endsection

routes/web.php

@@ -28,5 +28,6 @@
     Route::post('products/{product}/favorite', 'ProductsController@favor')->name('products.favor');
     Route::delete('products/{product}/favorite', 'ProductsController@disfavor')->name('products.disfavor');
     Route::get('products/favorites', 'ProductsController@favorites')->name('products.favorites');
+    Route::post('cart', 'CartController@add')->name('cart.add');
 });
 Route::get('products/{product}', 'ProductsController@show')->name('products.show');