从数据透视表雄辩地获取数据

Question

即使在阅读文档后，也很难从相关的“属性”表中获取“属性名称”，同时又要从“产品”表中查询具有枢轴“ product_properties”的产品。

我的模型：Models\Product::class，Models\Property::class，Models\ProductProperty::class，

如果我运行查询：

$product = new App\Models\Product();
$product->where('id', 1)->with('properties')->get();

我获得了完整的产品对象以及属性，并且效果很好，但是我不知道是如何从表中获取属性名称的properties。

总之，我需要显示与表相关的表中的属性名称。例如：130mm 宽度propertiesproduct_properties

我需要实现的是以下内容：

Illuminate\Database\Eloquent\Collection {#4400
     all: [
       App\Models\Product {
         id: 1,
         name: "Chrystal Block",
         details: "Ships in an exclusive branded box.",
         price: 50.00,
         has_shipment: 1,
         created_at: "2019-05-10 02:15:22",
         updated_at: "2019-05-10 02:15:22",
         deleted_at: null,
         properties: Illuminate\Database\Eloquent\Collection {
           all: [
             App\Models\ProductProperty {
               product_id: 4,
               property_id: 1,
               value: "130",
               unit: "mm",
               created_at: "2019-05-11 23:09:35",
               updated_at: "2019-05-11 23:09:35",
               deleted_at: null,

               // ***** This is what I'm looking for (hardcoded here *****
               property: Illuminate\Database\Eloquent\Collection {
                all: [
                    App\Models\Property {        
                        id: 1,
                        name: "width",
                        created_at: "2019-05-11 23:09:35",
                        updated_at: "2019-05-11 23:09:35",        
                    ]
                },

             },
             App\Models\ProductProperty {
               product_id: 4,
               property_id: 2,
               value: "17",
               unit: "mm",
               created_at: "2019-05-11 23:09:35",
               updated_at: "2019-05-11 23:09:35",
               deleted_at: null,
             },
             App\Models\ProductProperty {
               product_id: 4,
               property_id: 3,
               value: "60",
               unit: "mm",
               created_at: "2019-05-11 23:09:35",
               updated_at: "2019-05-11 23:09:35",
               deleted_at: null,
             },
             App\Models\ProductProperty {
               product_id: 4,
               property_id: 4,
               value: "2.78",
               unit: "kg",
               created_at: "2019-05-11 23:09:35",
               updated_at: "2019-05-11 23:09:35",
               deleted_at: null,
             },
           ],
         },
       },
     ],
   }

在此感谢您对口才查询的任何帮助。

我的表如下，带有示例数据：

表“ 产品 ”

+--------------+---------------------+------+-----+---------+----------------+
| Field        | Type                | Null | Key | Default | Extra          |
+--------------+---------------------+------+-----+---------+----------------+
| id           | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| name         | varchar(191)        | NO   |     | NULL    |                |
| details      | text                | NO   |     | NULL    |                |
| price        | double(8,2)         | NO   |     | NULL    |                |
| has_shipment | tinyint(1)          | NO   |     | NULL    |                |
| created_at   | timestamp           | YES  |     | NULL    |                |
| updated_at   | timestamp           | YES  |     | NULL    |                |
| deleted_at   | timestamp           | YES  |     | NULL    |                |
+--------------+---------------------+------+-----+---------+----------------+

值：

(1, 'Chrystal Block', 'Ships in an exclusive branded box.', 50.00, 1, '2019-05-10 02:15:22', '2019-05-10 02:15:22', NULL);

表的“ 属性 ”

+------------+---------------------+------+-----+---------+----------------+
| Field      | Type                | Null | Key | Default | Extra          |
+------------+---------------------+------+-----+---------+----------------+
| id         | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| name       | varchar(191)        | NO   |     | NULL    |                |
| created_at | timestamp           | YES  |     | NULL    |                |
| updated_at | timestamp           | YES  |     | NULL    |                |
| deleted_at | timestamp           | YES  |     | NULL    |                |
+------------+---------------------+------+-----+---------+----------------+

值：

(1, 'width', '2019-05-11 22:53:45', '2019-05-11 22:53:45', NULL),
(2, 'height', '2019-05-11 22:53:45', '2019-05-11 22:53:45', NULL),
(3, 'length', '2019-05-11 22:53:45', '2019-05-11 22:53:45', NULL),
(4, 'weight', '2019-05-11 22:53:45', '2019-05-11 22:53:45', NULL);

表' product_properties '

+-------------+---------------------+------+-----+---------+-------+
| Field       | Type                | Null | Key | Default | Extra |
+-------------+---------------------+------+-----+---------+-------+
| product_id  | int(10) unsigned    | NO   | MUL | NULL    |       |
| property_id | int(10) unsigned    | NO   | MUL | NULL    |       |
| value       | varchar(191)        | NO   |     | NULL    |       |
| unit        | varchar(191)        | NO   |     | NULL    |       |
| created_at  | timestamp           | YES  |     | NULL    |       |
| updated_at  | timestamp           | YES  |     | NULL    |       |
| deleted_at  | timestamp           | YES  |     | NULL    |       |
+-------------+---------------------+------+-----+---------+-------+

值：

(1, 1, '130', 'mm', '2019-05-11 23:09:35', '2019-05-11 23:09:35', NULL),
(1, 2, '17', 'mm', '2019-05-11 23:09:35', '2019-05-11 23:09:35', NULL),
(1, 3, '60', 'mm', '2019-05-11 23:09:35', '2019-05-11 23:09:35', NULL),
(1, 4, '2.78', 'kg', '2019-05-11 23:09:35', '2019-05-11 23:09:35', NULL);

Answer 1

为了获得关系的关系（嵌套关系），您可以尝试

$product->where('id', 1)->with('properties.property')->get();

我很喜欢这个答案中的解释，因为它很清楚。