How to find a latest data in array in mongoose

Question

I have a conversation model like below:

const ConvoSchema = mongoose.Schema({
    convoId: {
        type: String,
        required: true
    },
    seller: {
        type: String,
        required: true
    },
    buyer: {
        type: String,
        require: true
    },
    product: [{ type: Schema.Types.ObjectId, ref: 'Post' }],
    messages: [{ type: Schema.Types.ObjectId, ref: 'Message' }]
})

and I'm trying to get latest message in the Convo but couldn't figure out how to do it. any ideas?

Answer 1

_id basically contains the timestamp in it, so the first element that you get in .find() will be the oldest and the last element will be newest,

so by adding a sort like: { _id: -1} will give u the latest data

var Convo = mongoose.model('Convo', ConvoSchema); //init mongoose model

Convo.find()
     .limit(1)
     .sort({ _id: -1 })

you can remove the .limit() if u want complete list of documents

=======================================================================

Sorry for not reading it properly,

For Latest message,

Convo.findOne({}, response => {
   var data = response.toObject();
   latestMessage = data.messages.pop()
})