Recommended way to sort and getLatest of children

Hi! I have one question. I’m building a small chat app. My database has users and messages (relates to each other). The app has a Contactlist which shows all the users and Chatscreens with the messages.

I want to sort my contactlist by the last message for each contact. So the contact with the newest message will be the first one. The model of the contact looks like this now:

import { Model } from "@nozbe/watermelondb";
import { field, children, lazy } from "@nozbe/watermelondb/decorators";
import { Q } from "@nozbe/watermelondb";
import { action } from "@nozbe/watermelondb/decorators";

export default class Contact extends Model {
  static table = "contacts";

  static associations = {
    messages: { type: "has_many", foreignKey: "contact_id" }
  };

  @field("name") name;
  @field("image") image;
  @children("messages") messages;
  @lazy unreadMessages = this.messages.extend(Q.where("is_read", false));

  @action async markMessagesAsRead() {
    const unreadMessages = await this.unreadMessages.fetch();
    await unreadMessages.map(
      async message => await this.subAction(() => message.markAsRead())
    );
  }
}

```.

I'm wondering how could I sort the messages by a specific key (send date) and get the latest of it.
So I only can call contact.lastMessage or something like that. What is the recommended way to sort the messages in the model and get the latest?

[Bessonov]

Activity!

[vdlindenmark]

I think it’s okey to close this issue. Just watch https://github.com/Nozbe/WatermelonDB/pull/199 and wait till it’s fixed.