Sequelize: find count of 3 level associated model entries - mysql

Question

I have a products database structure as follows:
Categories > Sub categories > Child categories > Products
the respective table names in mySql database are:
categories, subCategories, childCategories and products
My model definitions are as follows:
////////////////// DEFINING ASSOCIATIONS /////////////
/******* CATEGORY - SUBCATEGORY ASSOCIATION *********/
db.category.hasMany(db.subCategory, {
foreignKey: 'categoryId',
sourceKey: 'id',
});
db.subCategory.belongsTo(db.category, {
foreignKey: 'categoryId',
targetKey: 'id',
});
/******* SUBCATEGORY - CHILDCATEGORY ASSOCIATION *********/
db.subCategory.hasMany(db.childCategory, {
foreignKey: 'subCategoryId',
sourceKey: 'id',
});
db.childCategory.belongsTo(db.subCategory, {
foreignKey: 'subCategoryId',
targetKey: 'id',
});
/******* CHILDCATEGORY - PRODUCT ASSOCIATION *********/
db.childCategory.hasMany(db.product, {
foreignKey: 'childCategoryId',
sourceKey: 'id',
});
db.product.belongsTo(db.childCategory, {
foreignKey: 'childCategoryId',
targetKey: 'id',
});
In my summary result, I want to share a table as follows:
For this, I tried multiple variations of the below code but am unable to produce the required result.
My current code to achieve the above result:
exports.getAllCategoriesSummary = async (req, res) => {
const { page, size, search } = req.query;
console.log(page, size, search);
try {
const totalCategories = await Category.count();
// get categories and count of included subCategories, childCategories and products
const [rows, fields] = await mysqlConnPool.promise().execute(
`SELECT c.id, c.name, COUNT(DISTINCT(s.id)) AS subCategories,
COUNT(DISTINCT(ch.id)) AS childCategories, COUNT(p.id) AS products
FROM categories c
LEFT JOIN subCategories s ON c.id = s.categoryId
LEFT JOIN childCategories ch ON s.id = ch.subCategoryId
LEFT JOIN products p ON ch.id = p.childCategoryId GROUP BY c.id
ORDER BY c.id ASC LIMIT ${size} OFFSET ${page * size}
`
);
return res.status(200).json({
status: 'success',
categories: rows,
totalCategories: totalCategories,
});
} catch (error) {
return res.status(500).json({
status: 'error',
message: error.message,
});
}
};
Requesting help to produce the needed result using sequelize.