MongoDB CRUD Operation Update
Example
Update the entire object:
db.people.update({name: 'Tom'}, {age: 29, name: 'Tom'})
// New in MongoDB 3.2
db.people.updateOne({name: 'Tom'},{age: 29, name: 'Tom'}) //Will replace only first matching document.
db.people.updateMany({name: 'Tom'},{age: 29, name: 'Tom'}) //Will replace all matching documents.
Or just update a single field of a document. In this case age:
db.people.update({name: 'Tom'}, {$set: {age: 29}})
You can also update multiple documents simultaneously by adding a third parameter. This query will update all documents where the name equals Tom:
db.people.update({name: 'Tom'}, {$set: {age: 29}}, {multi: true})
// New in MongoDB 3.2
db.people.updateOne({name: 'Tom'},{$set:{age: 30}) //Will update only first matching document.
db.people.updateMany({name: 'Tom'},{$set:{age: 30}}) //Will update all matching documents.
If a new field is coming for update, that field will be added to the document.
db.people.updateMany({name: 'Tom'},{$set:{age: 30, salary:50000}})// Document will have `salary` field as well.
If a document is needed to be replaced,
db.collection.replaceOne({name:'Tom'}, {name:'Lakmal',age:25,address:'Sri Lanka'})
can be used.
Note: Fields you use to identify the object will be saved in the updated document. Field that are not defined in the update section will be removed from the document.
