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I wonder how I could insert array of objects to Mongo collection "root-level documents" with own pre-defined _id values.

I have tried db.MyCollection.insert(array); but it creates nested documents under one single generated _id in MongoDB.

var array = [

      { _id: 'rg8nsoqsxhpNYho2N',
        goals: 0,
        assists: 1,
        total: 1                  },


      { _id: 'yKMx6sHQboL5m8Lqx',
        goals: 0,
        assists: 1,
        total: 1                  }];

db.MyCollection.insert(array);

What I want

I wonder how I could insert array of objects to Mongo collection "root-level documents" with own pre-defined _id values.

I have tried db.MyCollection.insert(array); but it creates nested documents under one single generated _id in MongoDB.

var array = [

      { _id: 'rg8nsoqsxhpNYho2N',
        goals: 0,
        assists: 1,
        total: 1                  },


      { _id: 'yKMx6sHQboL5m8Lqx',
        goals: 0,
        assists: 1,
        total: 1                  }];

db.MyCollection.insert(array);

What I want

• javascript
• json
• mongodb

Share Improve this question Follow edited Apr 27, 2016 at 13:00 justdiehard asked Apr 27, 2016 at 11:03 justdiehardjustdiehard 25911 gold badge22 silver badges1212 bronze badges 8

• 1 db.MyCollection.insert(array) should work. Are you getting any error message? – Sede Commented Apr 27, 2016 at 11:05
• Insert process works and I am having the data in collection but I would like to have objects at "root-level" and now they are inserted under "0": {}, "1": {} and so on. I would like to insert all my objects as "root-level" document with my _id value – justdiehard Commented Apr 27, 2016 at 11:09
• With the document you show us you can't get that result. – Sede Commented Apr 27, 2016 at 11:16
• 1 @sportsdiehard as user3100115 said db.collectionName.insert(array) will work for you, try using mongo shell for insert – Dhiraj Commented Apr 27, 2016 at 12:06
• 1 I see you have edited your question after I posted my answer. Have you tried it? Further, you should not post using screenshots, please, remove them an paste in the question body. – Héctor Valverde Commented Apr 27, 2016 at 13:12

 |  Show 3 more comments

3 Answers 3

Sorted by: Reset to default 15

db.collection.insertMany() is what you need (supported from 3.2):

db.users.insertMany(
   [
     { name: "bob", age: 42, status: "A", },
     { name: "ahn", age: 22, status: "A", },
     { name: "xi", age: 34, status: "D", }
   ]
)

output:

{
    "acknowledged" : true,
    "insertedIds" : [ 
        ObjectId("57d6c1d02e9af409e0553dff"), 
        ObjectId("57d6c1d02323d119e0b3c0e8"), 
        ObjectId("57d6c1d22323d119e0b3c16c")
    ]
}

Why not iterate over the array objects, and insert them one at a time?

array.forEach((item) => db.MyCollection.insert(item));

You can use MongoDB Bulk to insert multiple document in one single call to the database.

First iterate over your array and call the bulk method for each item:

bulk.insert(item)

After the loop, call execute:

bulk.execute()

Take a look at the refereed documentation to learn more.

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