Update Document
To update an existing document we can use the updateOne() or updateMany() methods.
The first parameter is a query object to define which document or documents should be updated.
The second parameter is an object defining the updated data.
updateOne()
The updateOne() method will update the first document that is found matching the provided query.
Let's see what the "like" count for the post with the title of "Post Title 1":
Example
db.posts.find( { title: "Post Title 1" } )
Now let's update the "likes" on this post to 2. To do this, we need to use the $set operator.
Example
db.posts.updateOne( { title: "Post Title 1" }, { $set: { likes: 2 } } )
Check the document again and you'll see that the "like" have been updated.
Example
db.posts.find( { title: "Post Title 1" } )
Insert if not found
If you would like to insert the document if it is not found, you can use the upsert option.
Example
db.posts.updateOne(
{ title: "Post Title 5" },
{
$set:
{
title: "Post Title 5",
body: "Body of post.",
category: "Event",
likes: 5,
tags: ["news", "events"],
date: Date()
}
},
{ upsert: true }
)
updateMany()
The updateMany() method will update all documents that match the provided query.
Example
db.posts.updateMany({}, { $inc: { likes: 1 } })
Now check the likes in all of the documents and you will see that they have all been incremented by 1.
