mongoose: save if not exists, won't update if exist

Question

In mongoose, is there one line code that can save the document if it does not exist otherwise DON'T update the existing one.

I have searched online but most of the answers are about updating on the existing one document.

Answer 1

After some lucky search, I found the following links which are really helpful:

• MongoDB atomic “findOrCreate”
• Mongodb how to insert ONLY if does not exists (no update if exist)
• Mongoose: atomic FindOne-Or-Insert(), do not update existing instance if found
• How to create item if not exists and return an error if exists

The key is to set $setOnInsert in update params, and upsert:true in options params.

Here is a code example:

let query = {id: searchId};
let update = { 
  $setOnInsert: {
    id: searchId,
    foo: foo,
    bar: bar,
  }
};
  
let options = { upsert: true };
SampleModel.findOneAndUpdate(query, update, options)
  .catch(error => console.error(error));

Any thoughts or answers or improvements are definitely welcome!

Answer 2

Edit: Note that this only works for an array!

Even though this is an old post, I found something that could help people coming across this.

Instead of using the $setOnInsert, you can use $addToSet. This will add whatever data you are inserting but if the data exists, then nothing will happen.

let query = {id: searchId};
let update = { 
  $addtoSet: {
    [id: searchId]
  }
};
  
SampleModel.findOneAndUpdate(query, update)
  .catch(error => console.error(error));