Node.js Sequelize：为联接查询绑定多个模型并创建自定义列

我想在Sequelize v5中应用一个join和groupBy，它将从五个模型中获取记录，并按以下格式返回记录

{
  "data": [
    {
      "products": {
        "id": "01",
        "name": "lorium",
        "description": "ipsum",
        "product_images": [
          {
            "url": "", // From images tbl
            "image_type": "Front" // From imge_types tbl
          },
          {
            "url": "",
            "image_type": "Back"
          }
        ]
      },
      "vendor": {
        "first_name": "john",
        "last_name": "doe"
      }
    }
  ]
}

我已经分别创建了所有五个模型，并为它们指定了关联

产品型号：：

供应商型号：：

产品图像模型：：

图像模型：：

图像类型模型：：

下面是我对其执行SQLize操作的存储库文件：Updated:：

public async getProductData() {
  var prodData = Product.findAll({
    include: [
      { model: Vendor, as: 'vendor' }, 
      { model: ProductImages, as: 'product_img_refs' }
    ]
  });
  return prodData;
}

---

我没有得到绑定所有模型的正确方法，这些模型将返回上述json格式中描述的结果。

我发现了问题。您试图将

ProductImages

模型包含到

Vendor

中。根据您的关联，

ProductImages

与

产品

关联，而不是与

供应商

关联

所以请试试这个

let prodData = Product.findAll({
    include: [
        { model: Vendor, as: 'vendor' },
        { model: ProductImages }
    ]
});

---

要获得问题中所示的嵌套输出，需要在以下各项之间创建关联：

• ProductImages

  和

  ImagesModel

• ProductImages

  和

  imagestypes

完成后，您可以在

findAll

选项中嵌套模型，如下所示：

// Create associations (depends on your data, may be different)
ProductImages.hasOne(ImagesModel);
ProductImages.hasOne(ImageTypes);

// Return product data with nested models
let prodData = Product.findAll({
    include: [
        { model: Vendor, as: 'vendor' },
        {
            model: ProductImages, as: 'product_img_refs',
            include: [
                { model: ImagesModel }, // Join ImagesModel onto ProductImages (add aliases as needed)
                { model: ImageTypes } // Join ImageTypes onto ProductImages (add aliases as needed)
            ]
        }
    ]
});

---

嗨@darshil，谢谢你点亮了这个东西；我已经在我的问题中更新了此模型关联。。。实际上，我正在寻找创建自定义列的解决方案，我已经用示例json格式显示了这些列。

const ImagesModel = SQLize.define('images', {
  id: { type: DataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true, },
  img_url: { type: DataTypes.STRING }
});
export { ImagesModel }

const ImageTypes = SQLize.define('image_types', {
  id: { type: DataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true, },
  image_type: { type: DataTypes.STRING }
});
export { ImageTypes }

public async getProductData() {
  var prodData = Product.findAll({
    include: [
      { model: Vendor, as: 'vendor' }, 
      { model: ProductImages, as: 'product_img_refs' }
    ]
  });
  return prodData;
}

let prodData = Product.findAll({
    include: [
        { model: Vendor, as: 'vendor' },
        { model: ProductImages }
    ]
});

// Create associations (depends on your data, may be different)
ProductImages.hasOne(ImagesModel);
ProductImages.hasOne(ImageTypes);

// Return product data with nested models
let prodData = Product.findAll({
    include: [
        { model: Vendor, as: 'vendor' },
        {
            model: ProductImages, as: 'product_img_refs',
            include: [
                { model: ImagesModel }, // Join ImagesModel onto ProductImages (add aliases as needed)
                { model: ImageTypes } // Join ImageTypes onto ProductImages (add aliases as needed)
            ]
        }
    ]
});