Question 223737 in Javascript Question posted in
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Javascript – Add new field to mongo if not exist

I have this document in my mongo-db

{
    "key": 1,
    "name" "abc"
  }

now I want to update it and want to set age as 20 so I used update query by keeping upsert as true but its not updating as age field don’t exist , how can I make query so it create the field if it doses not exist

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2

Answers


  1. 0

    If the field does not exist,
    $set
    will add a new field with the specified value

    doccumentation

    db.collection.updateOne(
  { "key": 1 }, 
  { $set: { "name": "abc", "age": 20 } }, // The update operation using $set to update "name" and set "age" to 20
  { upsert: true } // Optional: Set to true to insert a new document if no matching document is found
);
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  2. 0

    You can try using the findOneAndUpdate function

    Refer to https://sparkbyexamples.com/mongodb/mongodb-insert-if-not-exists/?amp=1

    
db.findOneAndUpdate(
   { key:1 },
   { $setOnInsert: { key: 1,name:”abc”,age: 20 } }, 
   { upsert: true, returnOriginal: false }
)
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