Here is my document schema:

  var UserSchema = new mongoose.Schema({
      username: {type: String, lowercase: true, unique: true},
      email: {type:String, unique: true},
      currentSquads: [{seriesId: String, squad: [String]}]
});

Given a _id(for the UserSchema document), seriesId and squad: I would like to update the user document with the new squad if the seriesId already exists in the currentSquads array, otherwise add a new object in the currentSquad array.

What is the best way to do this in Mongoose?