Sequelize: Bind multiple models for join query and create custom columns - node.js

Question

I'd like to apply a join and groupBy in Sequelize v5 that will fetch the records from five models tables and return the records as below format.
{
"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"
}
}
]
}
I have created separate all five models and assign association to them.
Product Model::
const Product = SQLize.define('product', {
id: { type: DataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true, }
product_title: { type: new DataTypes.STRING(255) },
vendor_id: { type: DataTypes.INTEGER.UNSIGNED }
});
Product.hasMany(ProductImages, {foreignKey: 'product_id', targetKey: 'id', as :'product_img_refs'})
export { Product };
Vendor Model::
const Vendor = SQLize.define('vendor', {
id: { type: DataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true, },
first_name: { type: DataTypes.STRING(100) },
last_name: { type: DataTypes.STRING(100) }
});
Product.belongsTo(Vendor, {foreignKey: 'id'})
Vendor.hasOne(Product, {foreignKey: 'id'})
export { Vendor }
Product Images Model::
const ProductImages = SQLize.define('product_images', {
id: { type: DataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true, },
product_id: { type: DataTypes.INTEGER },
product_image_id: { type: DataTypes.INTEGER }
img_type_id: { type: DataTypes.INTEGER }
});
export {ProductImages}
Images Model::
const ImagesModel = SQLize.define('images', {
id: { type: DataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true, },
img_url: { type: DataTypes.STRING }
});
export { ImagesModel }
Image Types Model::
const ImageTypes = SQLize.define('image_types', {
id: { type: DataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true, },
image_type: { type: DataTypes.STRING }
});
export { ImageTypes }
Below is the repository file on which i have performed the SQLize operation: Updated::
public async getProductData() {
var prodData = Product.findAll({
include: [
{ model: Vendor, as: 'vendor' },
{ model: ProductImages, as: 'product_img_refs' }
]
});
return prodData;
}
I am not getting the correct way to bind the all models that will return me a result as described in the above json format.

Answer 1

To get the nested output as shown in the question, you would need to create associations between the following:
ProductImages and ImagesModel
ProductImages and ImageTypes
Once done, you can nest the models in the findAll options as shown below:
// 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)
]
}
]
});

Answer 2

I found the issue. you were trying to include ProductImages model into Vendor. As per your association, ProductImages associate with Product not with Vendor.
So please try this
let prodData = Product.findAll({
include: [
{ model: Vendor, as: 'vendor' },
{ model: ProductImages }
]
});