Question

这个问题是关于续集查询的。查询具有多对多关系的三个表。以下查询：

const data = await product.findOne ({
   where: { product_id: id },
   include: [
     {
       model: category
     }
   ]
});

它返回以下json数据：

"category": {
        "product_id": 1,
        "name": "Arc d'Triomphe",
        "description": "This beautiful and iconic T-shirt will no doubt lead you to your own triumph.",
        "price": "14.99",
        "discounted_price": "0.00",
        "image": "arc-d-triomphe.gif",
        "image_2": "arc-d-triomphe-2.gif",
        "thumbnail": "arc-d-triomphe-thumbnail.gif",
        "display": 0,
        "categories": [
            {
                "category_id": 1,
                "name": "French",
                "description": "The French have always had an eye for beauty. One look at the T-shirts below and you'll see that same appreciation has been applied abundantly to their postage stamps. Below are some of our most beautiful and colorful T-shirts, so browse away! And don't forget to go all the way to the bottom - you don't want to miss any of them!",
                "department_id": 1,
                "product_category": {
                    "product_id": 1,
                    "category_id": 1
                }
            }
        ]
    }

我想使上面的json数据如下。如何查询？

"category": [
        {
            "category_id": 1,
            "name": "French",
            "department_id": 1
        }
    ]

如果需要模型文件，可以给我评论吗？

Answer 1

您可以在此document上找到属性。我们有这样一个简单的代码：

const data = await product.findOne ({
   where: {product_id: id},
   include: [
     {
       model: category,
       attributes: ['category_id', 'name', 'department_id']
     }
   ]
});

Answer 2

查询如下所示：

const query = await product.findOne({
   where: { product_id: id },
   include: {
     model: category,
     attributes: ['category_id', 'name', 'department_id'],
     through: { attributes: [] }
   },
   attributes: []
});

显示以下json数据：

 "category": {
     "categories": [
         {
             "category_id": 1,
             "name": "French",
             "department_id": 1
         }
     ]
 }

关键点是through: { attributes: [] }。

ORM：Sequelize：除一些json数据外，如何返回？

2 个答案: