Insert data into inner array in MongoDB?

You can use $addToSet operator for this. Let us first create a collection with documents −

> db.insertDataIntoArrayDemo.insertOne(
   {
      "UserDetails":[
         {
            "UserId" :"user121",
            "userGroupMessage":[]
         },
         {
            "UserId" :"user221",
            "userGroupMessage":["Cool","Good Morning"]
         }
      ]
   }
);
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd694e157806ebf1256f128")
}

Following is the query to display all documents from a collection with the help of find() method −

> db.insertDataIntoArrayDemo.find().pretty();

This will produce the following output −

{
   "_id" : ObjectId("5cd694e157806ebf1256f128"),
   "UserDetails" : [
      {
         "UserId" : "user121",
         "userGroupMessage" : [ ]
      },
      {
         "UserId" : "user221",
         "userGroupMessage" : [
            "Cool",
            "Good Morning"
         ]
      }
   ]
}

Following is the query to insert data into inner array in MongoDB −

> db.insertDataIntoArrayDemo.update({"UserDetails.UserId":"user121"},
   {"$addToSet":{"UserDetails.$.userGroupMessage":"Hello"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

Let us check the document once again −

> db.insertDataIntoArrayDemo.find().pretty();

This will produce the following output −

{
   "_id" : ObjectId("5cd694e157806ebf1256f128"),
   "UserDetails" : [
      {
         "UserId" : "user121",
         "userGroupMessage" : [
            "Hello"
         ]
      },
      {
         "UserId" : "user221",
         "userGroupMessage" : [
            "Cool",
            "Good Morning"
         ]
      }
   ]
}

Nishtha Thakur

Updated on 30-Jul-2019 22:30:26

• Related Questions & Answers
• How to sort inner array in MongoDB?
• Accessing inner element of JSON array in MongoDB?
• Check duplicates of certain field for inner array in MongoDB
• Insert to specific index for MongoDB array?
• Array index or indexing inner items in MongoDB to fetch values
• Using EF to insert data into SAP Business One.
• How can we insert data into a MySQL table?
• How to insert data into a CachedRowSet in JDBC? Explain?
• How to insert data into a MySQL database with Java?
• How to insert Binary data into a table using JDBC?
• How to insert a document into a MongoDB collection using Java?
• How to insert multiple document into a MongoDB collection using Java?
• How to insert new documents into a MongoDB collection in your database?
• Cannot push into an array from MongoDB?
• Is there any way in MongoDB to get the inner value of json data?