How to update multiple objects in loopback?

Question

can somebody help me to update some multiple object in loopback but i don't have any idea on how to do it..

this is what i tried...

Bond.ParseBondQoutesheet = (data, cb) => { //eslint-disable-line
    //// now update multiple
    for (let i = 0; i <= data.length; i = +i) {
        const filter = {
            where: { id: data[i].id },
        };
        Bond.findOne(filter, (err, newdata) => {
            if (!err) {
                newdata.updateAttributes(data[i], function (err, updated) {
                    if (!err) {
                        if (data.length === i) {
                            console.log('updated success')
                            cb(null, updated);
                        }
                    } else {
                        console.log('err')
                        console.log(err)
                        cb(err, null);
                    }
                })
            } else {
                cb(err, null);
            }
        });
    }
};

is this correct?

ALPHA · Accepted Answer · 2019-01-12 10:38:37Z

1

You can run that but because of JavaScript's async nature it will behave unexpectedly what you can do in order to solve this would be to loop it using recursive method like this

Bond.ParseBondQoutesheet = (data, cb) => { //eslint-disable-line
    //// now update multiple
    let data = data;
    updateAllSync(0);
    function updateAllSync(i) {
        if (i < data.length) {
            const filter = {
                where: { id: data[i].id },
            };

            Bond.findOne(filter, (err, newdata) => {
                if (!err) {
                    newdata.updateAttributes(data[i], function (err, updated) {
                        if (!err) {
                            if (data.length === i) {
                                console.log('updated success')
                                updateAllSync(i+1);
                            }
                        } else {
                            console.log('err')
                            console.log(err)
                            cb(err, null);
                        }
                    })
                } else {
                    cb(err, null);
                }
            });
        }else{
            cb(null,i); // finished updating all docs sync
        }
    }
    };

edited Jan 12, 2019 at 10:38

answered Jan 12, 2019 at 9:47

ALPHA

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4 Comments

ALPHA Over a year ago

you need to make this process run Synchronously other wise it wil behave unexpectedly.. use this code I have provided and you should be fine..

Yamoshi Wolverine Over a year ago

wow great thanks!, but is this the correcy way of updating multiple objects in loopback? sorry i'm newbie here..

ALPHA Over a year ago

well since you need to do this sync way this is the way to do it. because this process need to run one ofter another. there is a method called updateMany() but that's just another story considering your case. if you find this answer was helpful, please mark it as the answer

ALPHA Over a year ago

you can read about it in here but you can't use it in here. because of your execution needs retrieve data from the db and update it . When using updateMany() - mongoosejs.com/docs/api.html#model_Model.updateMany it will only update all the documents matching the same criteria

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