mongodb 中的批量操作

Question

So I have this array for my collection that I need to store using Bulk Operations:

let arr = [
    {
        name: "John",
        marks: 3
    },
    {
        name: "Mike",
        marks: 2
    },
    {
        name: "Andrew",
        marks: 6
    },
    {
        name: "John",
        marks: 8
    },
    {
        name: "John",
        marks: 4
    },
    {
        name: "John",
        marks: 2
    },
    {
        name: "Mike",
        marks: 1
    },
    {
        name: "Andew",
        marks: 3
    },
    {
        name: "Mike",
        marks: 6
    }
]

So what I am currently doing now is:

for(var i = 0; i < arr.length; i++){

    if(Students.findOne({name: arr[i].name})){

        Students.update({name: arr[i].name}, {$inc: {marks: arr[i].marks]}});
    }
    else {

        Students.insert({name: arr[i].name, marks: arr[i].marks]});
    }
}

Now I have so many records in array which I have to add in Mongodb every minute. So I need to perform this operation very fast. How can I achieve this same behavior using Mongodb Bulk Operations? So I have this array for my collection that I need to store using Bulk Operations:

let arr = [
    {
        name: "John",
        marks: 3
    },
    {
        name: "Mike",
        marks: 2
    },
    {
        name: "Andrew",
        marks: 6
    },
    {
        name: "John",
        marks: 8
    },
    {
        name: "John",
        marks: 4
    },
    {
        name: "John",
        marks: 2
    },
    {
        name: "Mike",
        marks: 1
    },
    {
        name: "Andew",
        marks: 3
    },
    {
        name: "Mike",
        marks: 6
    }
]

So what I am currently doing now is:

for(var i = 0; i < arr.length; i++){

    if(Students.findOne({name: arr[i].name})){

        Students.update({name: arr[i].name}, {$inc: {marks: arr[i].marks]}});
    }
    else {

        Students.insert({name: arr[i].name, marks: arr[i].marks]});
    }
}

Now I have so many records in array which I have to add in Mongodb every minute. So I need to perform this operation very fast. How can I achieve this same behavior using Mongodb Bulk Operations?

Answer 1

you can use upsert in updateOne and Update. so it will kinda look like

Students.update({name: arr[i].name}, {{upsert: true},{$set: data, $inc: {marks: arr[i].marks]}}});

i would recommend to use updateOne if you dont want want the possibility to change multiple records

https://www.mongodb.com/docs/manual/reference/method/db.collection.updateOne/