我有一个 products , attributes ，和 product_attributes table。每个产品可以有多个 attributes 这些关系储存在 product_attributes ，到目前为止还不错。但是一个产品可以多次具有相同的属性。我只能将不同的属性链接到一个产品。
例如：
奥迪（产品）有轮子（属性）：数量（joindata）=2；值（joindata）=“前”；
和
奥迪（产品）有轮子（属性）：数量（joindata）=2；值（joindata）=“后”；
仅保存值为rear的属性wheel，前轮将丢失。
控制器中没有错误。
这是 $this->request->getData() ```
/src/Controller/ProductsController.php (line 62)
[
'type_id' => '12',
'name' => 'Audi',
'thumbnail' => '',
'image' => '',
'attributes' => [
(int) 0 => [
'unique_id' => '9',
'_joinData' => [
'amount' => '2',
'value' => '1',
'information' => 'front'
]
],
(int) 1 => [
'unique_id' => '9',
'_joinData' => [
'amount' => '2',
'value' => '1',
'information' => 'rear'
]
]
]
]

这是 `$product` 修补实体后：

object(App\Model\Entity\Product) {

'type_id' => (int) 12,
'name' => 'Audi',
'thumbnail' => '',
'image' => '',
'attributes' => [
    (int) 0 => object(App\Model\Entity\Attribute) {

        'unique_id' => (int) 9,
        'category_id' => (int) 8,
        'name' => 'VDSL2',
        'unit' => '',
        '_joinData' => object(App\Model\Entity\ProductsAttribute) {

            'amount' => (int) 2,
            'value' => (float) 1,
            'information' => 'rear',
            '[new]' => true,
            '[accessible]' => [
                '*' => true
            ],
            '[dirty]' => [
                'amount' => true,
                'value' => true,
                'information' => true
            ],
            '[original]' => [],
            '[virtual]' => [],
            '[errors]' => [],
            '[invalid]' => [],
            '[repository]' => 'ProductsAttributes'

        },
        '[new]' => false,
        '[accessible]' => [
            '*' => true
        ],
        '[dirty]' => [
            '_joinData' => true
        ],
        '[original]' => [
            '_joinData' => [
                'amount' => '2',
                'value' => '0',
                'information' => 'front'
            ]
        ],
        '[virtual]' => [],
        '[errors]' => [],
        '[invalid]' => [],
        '[repository]' => 'Attributes'

    },
    (int) 1 => object(App\Model\Entity\Attribute) {

        'unique_id' => (int) 9,
        'category_id' => (int) 8,
        'name' => 'VDSL2',
        'unit' => '',
        '_joinData' => object(App\Model\Entity\ProductsAttribute) {

            'amount' => (int) 2,
            'value' => (float) 1,
            'information' => 'rear',
            '[new]' => true,
            '[accessible]' => [
                '*' => true
            ],
            '[dirty]' => [
                'amount' => true,
                'value' => true,
                'information' => true
            ],
            '[original]' => [],
            '[virtual]' => [],
            '[errors]' => [],
            '[invalid]' => [],
            '[repository]' => 'ProductsAttributes'

        },
        '[new]' => false,
        '[accessible]' => [
            '*' => true
        ],
        '[dirty]' => [
            '_joinData' => true
        ],
        '[original]' => [
            '_joinData' => [
                'amount' => '2',
                'value' => '0',
                'information' => 'front'
            ]
        ],
        '[virtual]' => [],
        '[errors]' => [],
        '[invalid]' => [],
        '[repository]' => 'Attributes'

    }
],
'[new]' => true,
'[accessible]' => [
    'type_id' => true,
    'name' => true,
    'thumbnail' => true,
    'image' => true,
    'type' => true,
    'attributes' => true
],
'[dirty]' => [
    'type_id' => true,
    'name' => true,
    'thumbnail' => true,
    'image' => true,
    'attributes' => true
],
'[original]' => [],
'[virtual]' => [],
'[errors]' => [],
'[invalid]' => [],
'[repository]' => 'Products'

}

productcontroller添加函数：

public function add(){
$product = $this->Products->newEntity();
if ($this->request->is('post')) {
$product = $this->Products->patchEntity($product, $this->request->getData(), [
'associated' => [
'Attributes',
'Attributes._joinData'
]
]);
/debug($this->request->getData());
debug($product);
die();/
if ($this->Products->save($product)) {
$this->Flash->success(__('The product has been saved.'));

            return $this->redirect(['action' => 'index']);
        }
        $this->Flash->error(__('The product could not be saved. Please, try again.'));
    }
    $types = $this->Products->Types->find('list', ['limit' => 200]);
    $attributes = $this->Products->Attributes->find('list', ['limit' => 200]);
    $this->set(compact('product', 'types', 'attributes'));

}

这和我的亲戚有关。
产品表：

$this->belongsToMany('Attributes', [
'foreignKey' => 'product_id',
'targetForeignKey' => 'attribute_id',
'joinTable' => 'products_attributes'
]);

属性表：

$this->belongsToMany('Products', [
'foreignKey' => 'attribute_id',
'targetForeignKey' => 'product_id',
'joinTable' => 'products_attributes'
]);

这些是属性 `product_attributes` 数据库中有：

unique_iq INT,
product_id INT,
attribute_id INT,
amount INT,
value DOUBLE,
information VARCHAR(150)

节约策略解决不了我的问题。还是一样的结果。