How to insert field in already existing nested documents in mongodb?

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I have the following document structure.

{ 
    "_id" : ObjectId("585a985f67962d91c0f3a1f6"), 
    "Email" : "abc@gmail.com", 
    "PhoneNumber" : "9999999999", 
    "TwoFactorEnabled" : false, 
    "LockoutEndDateUtc" : null, 
    "LockoutEnabled" : true, 
    "AccessFailedCount" : NumberInt(0), 

    "DisplayName" : "Nilesh Guria", 
    "CreatedOn" : ISODate("2016-12-21T14:57:35.379+0000"), 
    "UpdatedOn" : ISODate("2018-09-17T21:32:16.027+0000"),  
    "Wallet" : {
        "Balance" : 1000,
        "UnbilledUsage": 100
    }
}

I want to add a field called "CustomerCredit" with a default value of 0 inside the "Wallet" field in all such documents. How to achieve this ?

From python shell.

db.collection.update_many({"$set": {"Wallet.CustomerCredit": 0}})

You can use update_many since update is now deprecated. From mongoshell

db.collection.updateMany({},{$set: {"Wallet.CustomerCredit": 0}})

$addFields (aggregation), $addFields outputs documents that contain all existing fields from the input documents Specify the name of each field to add and set its value to an aggregation expression. To add field or fields to embedded documents (​including documents in arrays) use the dot notation. Adding Fields to an Embedded Document¶. DBHawk is a web-based MongoDB GUI, recursively and view all data into JSON viewer by just right clicking on the existing document. alter table add column; how to insert a new field on an existing document in the non existing field geolocCountry on the existing document fields in MongoDB document.

db.collection("collectionName")
  .updateMany({ "Wallet.CustomerCredit": { $exists: false }},
          { $set:{ "Wallet.CustomerCredit": 0 }});

Query on Embedded/Nested Documents, Query/select by embedded documents/nested fields/subdocuments. To specify an equality condition on a field that is an embedded/nested document, use the  How to insert document or fields in nested documents in mongo. MongoDB update data in nested field. embed existing document in new document in MongoDB. 1.

Try something like this:

db.collection.aggregate([
    {
        $addFields{
             "Wallet.CustomerCredit": 0
        }
    }
])

See the docs

Insert Documents, If the collection does not currently exist, insert operations will create the If the document does not specify an _id field, MongoDB adds the _id field with an  You just need to use $set operator. See below example, Existing document: {“first_name”: “Prashant”} To add a new field called “sir_name” with a value as

db.collection.insert(), If the collection does not exist, then the insert() method will create the collection. If the document does not specify an _id field, then MongoDB will add the _id field For many scenarios, the denormalized data model (embedded documents​  The examples on this page use the inventory collection. To populate the inventory collection, run the following: This page provides examples of query operations on embedded/nested documents using the MongoDB::Collection::find() method in the MongoDB Perl Driver. The examples on this page use the inventory collection.

$addToSet, To specify a <field> in an embedded document or in an array, use dot notation. are no duplicate items added to the set and does not affect existing duplicate  db.collection.insert () can be used inside multi-document transactions. The collection must already exist. An insert operation that would result in the creation of a new collection are not allowed in a transaction. Do not explicitly set the write concern for the operation if run in a transaction. To use write concern with transactions, see

Update Operator: $set, To specify a <field> in an embedded document or in an array, use dot notation. Behavior¶. If the field does not exist, $set will add a new field with the specified  To insert a single document using MongoDB Compass: Navigate to the collection you wish to insert the document into: In the left-hand MongoDB Compass navigation pane, click the database to which your target collection belongs. From the database view, click the target collection name. Click the Insert Document button: