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

The question is "a bit" old, but what I do in this kind of situation is generate the subdocument's id before inserting it.

var subDocument = {
    _id: mongoose.Types.ObjectId(),
    ba:235,
    bb:"World"
};

m['b'].push(subDocument);

m.save(function(err,model){
  // I already know the id!
  console.log(subDocument._id);
});

This way, even if there are other database operations between the save and the callback, it won't affect the id already created.