how to add fields in a single document in mongodb

Question

I am new to MongoDB and I have the following documents:

{
    "_id":ObjectID("55b89409b7d7df8c3d201618"),  
    "name":"John" 
}, 
{ 
    "_id":ObjectID("55b14359b7d7df8c3d20161c"), 
    "name":"Bahubali",  
    "products":7,  
    "contact_no":8819936800 
}

I need to edit the document which has the name "John". I need to add more fields to this document. But, when I use update, it can update only the specific name field and when I use save, it replaces the existing document with new document.

Is there any other approach to add new fields to the above document without using save. Because whenever we use save, we will require to rewrite the whole document.

possible duplicate of Add new field to a collection in MongoDB — Neo-coder
– Neo-coder, Commented Jul 29, 2015 at 11:55

bagrat · Accepted Answer · 2015-07-29 15:14:48Z

4

You can use the $set operator for it:

Example:

db.products.update(
   { name: "John" },
   { $set:
      {
        quantity: 500,
        details: { model: "14Q3", make: "xyz" },
        tags: [ "coats", "outerwear", "clothing" ]
      }
   }
)

edited Jul 29, 2015 at 15:14

bagrat

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answered Jul 29, 2015 at 11:45

Man Programmer

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2 Comments

Blakes Seven Over a year ago

Edit this to be relevant to the information asked in the question and I'll give you a smiley stamp for your effort. Explain why it is better and two smiley stamps

djvg Sep 12 at 10:13

Recent versions use updateOne() or updateMany(). Also note $set is an alias for $addFields.

Wasimkhana · Accepted Answer · 2021-10-26 09:25:26Z

0

Try this in your mongoShell.

db.yourCollection.updateMany({"name":"john"}, {$set:{"products":7, "contact_no":8819936800}})

answered Oct 26, 2021 at 9:25

Wasimkhana

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