What is the difference between save and insert in Mongo DB?
mongodb
Solution
Save Vs Insert :
In your given examples, the behavior is essentially the same.
`save` behaves differently if it is passed with an "_id" parameter.
For save, If the document contains `_id`, it will upsert querying the collection on the `_id` field, If not, it will insert.
If a document does not exist with the specified _id value, the save() method performs an insert with the specified fields in the document.
If a document exists with the specified _id value, the save() method performs an update, replacing all field in the existing record with the fields from the document.
Save vs Update :
`update` modifies an existing document matched with your query params. If there is no such matching document, that's when `upsert` comes in picture.
- `upsert : false` : Nothing happens when no such document exist
- `upsert : true` : New doc gets created with contents equal to query params and update params
`save` : Doesn't allow any query-params. if `_id` exists and there is a matching doc with the same `_id`, it replaces it. When no _id specified/no matching document, it inserts the document as a new one.
Problem
What is the difference between save and insert in Mongo DB? both looks the same ``` db.users.save({username:"google",password:"google123"}) db.users.insert({username:"google",password:"google123"}) ```