Mongodb / Mongoose : Equivalent to GROUP BY + ORDER BY

I have a mongodb database and I'm using Mongoose above it.

I have this model for a Message :

var MessageSchema = new mongoose.Schema({
room: {
    type: ObjectId,
    ref: 'Room'
},
text: {
    type: String
},
date: {
    type: Date,
    default: Date.now,
}});

I would like to get the latest message for each room, ordered by date. In SQL, it would give something like :

SELECT * FROM messages GROUP BY room ORDER BY date ASC

How can I achieve this? Thanks