find id of latest subdocument inserted in mongoose

Question

i have a model schema as :

var A = new Schema ({
  a: String,
  b : [ { ba: Integer, bb: String } ]
}, { collection: \'a\' } );

then

<

Answer 1

If you have a separate schema for your subdocument, then you can create the new subdocument from a model before you push it on to your parent document and it will have an ID:

var bSchema = new mongoose.Schema({
  ba: Integer,
  bb: String
};

var a = new mongoose.Schema({
  a: String,
  b : [ bSchema ]
});

var bModel = mongoose.model('b', bSchema);
var subdoc = new bModel({
  ba: 5,
  bb: "hello"
});

console.log(subdoc._id);    // Voila!

Later you can add it to your parent document:

m['b'].push(subdoc)
m.save(...