ChatRooms
Participants
Messages
Users

//   My current code is:

User.findAll({
        include: [
            {
                model: Participant,
                include: [
                    {
                        model: ChatRoom,
                        include: [{ model: Message}]
                    }
                ],
                order: [[ChatRoom, Message, 'id', 'DESC']]
            }
        ],
    })

// This is what my server is returning right now,
// but the ordering is not working:
// participantId: 2 should be on top as it has a more recent message
{
    userId: 1,
    name: 'Kevin',
    participants: [
        {
            participantId: 1,
            userId: 1,
            chatRoomId: 1,
            chatRoom:
            {
                chatRoomId: 1,
                Messages: [{
                    MessageId: 1,
                    message: 'message1',
                    userId: 1
                },
                {
                    MessageId: 2,
                    message: 'message2',
                    userId: 2
                }]
            }
        },
        {
            participantId: 2,
            userId: 1,
            chatRoomId: 2,
            chatRoom:
            {
                chatRoomId: 2,
                Messages: [{
                    MessageId: 3,
                    message: 'message3',
                    userId: 1
                },
                {
                    MessageId: 4,
                    message: 'message4',
                    userId: 3
                }]
            }
        }
    ]
}