Node JavaScript express JavaScript format data get from the sequlize query

Question

I am using sequlize in express JavaScript framework.

const data = await db.Tour.findAll();
res.status(200).json(data)

If I do this I can nicely retrieve the data in the front-end vue JavaScript spa like this

{
    tour_name:"Bali",
    activities:[
        {name:"Swimming"},
        {name:"Beach vollyball"},
    ]
}

Above one is for retrieve the data for front-end.

If I need to get the data and make some changes in the controller before send them, I will raw: true then I can get the same output in my controller. But the problem is raw: true is not going well with the joins, so that point getting the data from the controller and make some changes to it is very hard. I have to access so many nested objects to find the data I want. Is there a smarter way (there should be) to get the above format from the controller without using the raw: true .

I hope there must be a nice way to pass that data object to some thing and convert to the format. How do I achieve this?

Answer 1

In below code I had to retrieve a shops products images and its ids along with some other data like ratings, count etc.

In below code I had to retrieve a shop products images and its ids.


exports.filterShopListings = async (data) => {

    return Db.sequelize.query("SELECT productImages, S.shopId, S.currency, S.mainImage, S.mainImageThumb, S.coverImage, S.coverImageThumb, S.name, S.location, S.approved, S.locationLatitude, CONCAT('"+process.env.QR_URL+"',S.qrCode) as qrCode, S.locationLongitude, COALESCE(productCount,0) as productCount, COALESCE(ratingCount,0) as ratingCount, COALESCE(ROUND(UR.ratingAvg,1) ,0) as ratings, COALESCE(shopFollowing,0) as followingCount FROM shops as S JOIN users U ON (U.userId=S.userId AND U.blocked='0') LEFT JOIN ( SELECT COUNT(*) as productCount, shopId, GROUP_CONCAT(mainImageThumb,'--',shopProductId) as productImages FROM shopProducts WHERE shopProducts.deleted='0' AND shopProducts.blocked='0' GROUP BY shopId)  SP ON (SP.shopId=S.shopId) LEFT JOIN ( SELECT COUNT(*) as ratingCount, AVG(ratings) as ratingAvg, shopId FROM userRatings WHERE userRatings.blocked='0' AND userRatings.deleted='0' GROUP BY shopId ) UR ON (UR.shopId=S.shopId) LEFT JOIN ( SELECT COUNT(*) as shopFollowing, shopId FROM shopFollowings GROUP BY shopId) SF ON (SF.shopId=S.shopId) WHERE "+data.whereString+" HAVING "+data.havingString+" ORDER BY "+data.orderingParam+" "+data.orderingSort+" LIMIT "+data.skip+", "+data.take+" ",{ type: Sequelize.QueryTypes.SELECT})
        .then( (shops) => {

            shops = JSON.parse(JSON.stringify(shops));

            shops.forEach(  (shop) => {

                //shop.productImagesTemp  = shop.productImages;
                shop.productImages = shopImagesFunc(shop.productImages);

            });

            return shops;

        });

};

And The shopImagesFunc Code -

    var shopImagesFunc = (productImages) => {

    if(productImages ==null)
        return [];

    var images = (productImages.split(",").filter(Boolean));

    var newImages = [];
    images.forEach(image => {

        let temp = image.split("--").filter(Boolean);

        newImages.push({
            shopProductId: parseInt(temp[1]),
            mainImage: temp[0],
        });

    });

    return newImages;

};

SQL Query is little complicated but creating a common function to format into required output would be very useful.