Storing messages in new conversation collections; MongoDB - database

Question

I'm a student working on a chat application for my internship, where I use socket.io.
Right now I am busy thinking of a good way to store the messages send in conversations.
As of now I do the following:
For each conversation between one user and another user, a new collection is made.
On every message sent, the message is stored in the according conversation collection in a single document.
The collections:
Where the document looks as follows:
Now I wonder if there is a good argument to be made to have just one collection "conversations", and store all the messages in multiple documents, where each conversation is a new document.

Answer 1

Creating a new collection for every message is very bad idea instead of that you use a simple schema as given below to store your messages
const conversation_schema = new Schema({
from: {
type: ObjectID,
ref: 'User'
},
to: {
type: ObjectID,
ref: 'User'
},
messageBody: { // body of the message(text body/ image blob/ video blob)
type: String,
},
messageType: { // type of the message(text, mp3, mp4, etc...)
type: String,
},
read: { // to boolean flag to mark whether the to user has read the message
type: Boolean,
default: false,
},
createdAt: { // when was this message goit created
type: Date,
default: new Date(),
},
});
you can fetch the conversation between the two users using the following query
conversations.find({
$or: [
{from: 'user1', TO: 'user2},
{from: 'user2', TO: 'user1},
],
}).populate({ path: 'to', model: User })
.populate({ path: 'from', model: User })
.sort({ createdAt: -1 })