laravel 雄辩的关系多重

Question

这是我的产品型号

public function orders(){
    return $this->hasMany(Order::class);
}

这是我的订单模型

 public function user(){
      return $this->belongsTo(User::class);
 }
 public function product(){
      return $this->belongsTo(Product::class);
 }

还有我的订单表结构

这是我目前的回复（我使用的是订单模型）。

{
    id: 11,
    quantity: 2,
    customer: {
        id: 6,
        name: "saging",
        email: "saging@gmail.com",
        role_id: 3,
    },
    items: {
        id: 7,
        name: "Pellentesque semper",
        description: "raesent sit amet elementum purus. ",
        price: "72.21",
        cover_image: "7CPVS7yjqba9iJ7J.jpg",
    }
},

{
    id: 12,
    quantity: 2,
    customer: {
        id: 6,
        name: "saging",
        email: "saging@gmail.com",
        role_id: 3,
    },
    items: {
        id: 3,
        name: "Donec nec mattis ligula",
        description: "Pellentesque semper, augue at aliquet tincidunt",
        price: "33.21",
        cover_image: "ZJbbzjPwDXrcbkwi.jpg",
    }
 }

我目前使用的代码是

$products = Order::with('user','product');
return OrdersResource::collection($products->paginate(5));

我使用我的Order Model 中的方法列出products and customer

我想要的输出是这样的

{
    id: 12,
    quantity: 2,
    customer: {
        id: 6,
        name: "saging",
        email: "saging@gmail.com",
        role_id: 3,
    },
    items: [
        {
            id: 3,
            name: "Donec nec mattis ligula",
            description: "Pellentesque semper, augue at aliquet tincidunt",
            price: "33.21",
            cover_image: "ZJbbzjPwDXrcbkwi.jpg",
        },
        {
            id: 7,
            name: "Pellentesque semper",
            description: "raesent sit amet elementum purus. ",
            price: "72.21",
            cover_image: "7CPVS7yjqba9iJ7J.jpg",
        }
    ]
 }

这是我的 OrderResource 代码

$sub_total = $this->quantity * $this->product->price;
$discount = round((10 / 100) * $sub_total, 2);
$total = $sub_total - $discount;

return [
    'id' => $this->id,
    'quantity' => $this->quantity,
    'address' => $this->address,
    'sub_total' => $sub_total,
    'discount' => $discount,
    'total_price' => $total,
    'created_at' => Carbon::parse($this->created_at)->format('F d, Y h:i:s A'),
    'customer' => $this->user,
    'items' => $this->product,
    ];

我的关系有问题吗？我是 laravel 的新手，雄辩的关系是我总是跳过的部分，因为我很困惑。但现在我必须面对它。

Answer 1

订单和产品之间的关系存在问题，您必须设置多对多关系，因为您需要：

• 创建第三个表名order_product 应该包含order_id 和product_id

• 在模型中设置关系：

  Product 型号：

  public function orders()
  {
      return $this->belongsToMany('App\Order');
  }
  

  Order 型号：

  public function products()
  {
      return $this->belongsToMany('App\Product');
  }
  

• 最后你必须创建一个ProductResource 并且在OrderResource 你必须这样做：

  return [
      'id' => $this->id,
      'quantity' => $this->quantity,
      'address' => $this->address,
      'sub_total' => $sub_total,
      'discount' => $discount,
      'total_price' => $total,
      'created_at' => Carbon::parse($this->created_at)->format('F d, Y h:i:s A'),
      'customer' => $this->user,
      'items' => ProductResource::collection($this->products)
      ];
  

Answer 2

从orders 表中删除product_id 和quantity 并像这样创建一个表order_product

order_product(id, order_id, product_id, quantity)

订单模式

public function products()
{
    return $this->belongsToMany('App\Product')->withPivot('quantity')->withTimestamps();
}

产品型号

public function orders()
{
    return $this->belongsToMany('App\Order')->withPivot('quantity')->withTimestamps();
}

现在创建一个ProductResource 类

return [
    'id' => $this->id,
    'name' => $this->name,
    'description' => $this->description,
    'price' => $this->price,
 ];

现在更改 OrderResource 类

$sub_total= 0;
$quantity = 0;

foreach($this->products as $product){
  $sub_total += ($product->pivot->quantity * $product->price);
  $quantity += $product->pivot->quantity;
}

$discount = round((10 / 100) * $sub_total, 2);

$total = $sub_total - $discount;

return [
    'id' => $this->id,
    'quantity' => $quantity,
    'address' => $this->address,
    'sub_total' => $sub_total,
    'discount' => $discount,
    'total_price' => $total,
    'created_at' => Carbon::parse($this->created_at)->format('F d, Y h:i:s A'),
    'customer' => $this->user,
    'items' => ProductResource::collection($this->products),
    ];

创建订单后，像这样插入订单产品

$order->products()->attach([
    10 => ['quantity' => 1],
    22 => ['quantity' => 2]
]);

这里的 10 和 22 是产品 ID

在此处查看详细信息https://laravel.com/docs/5.6/eloquent-relationships#many-to-many