Advice for MongoDB schema design for social media post - database

Question

I have been using MongoDB for my application but would like to add a social media post feature into the system. However, given the requirements, I find that it is not easy to come up with a MongoDB schema that would be effective for my use case. Any expert here care to share their suggestions?
The requirements are:
User can post social media post (imagine instagram posts)
User will view social media posts by other users
When a post is on a user screen for 5 second, we will record that the user has seen the post
Post that are seen will be appears in the user's social media feed
Any help would be appreciated, thank you!

Answer 1

You can refer below schema which we require to manage users and their post along with post history like ( who liked, who watched and who add comments)
// Users schema
const userSchema = new Schema({
name: {
type: String,
trim: true
}
});
// Post related media schema
const postMediaSchema = new Schema({
url: {
type: String,
trim: true
}
}, {
_id: false
})
// Post schema
const postSchema = new Schema({
userId: {
type: Schema.Types.ObjectId,
ref:'users',
},
title: {
type: String,
trim: true
},
description: {
type: String,
trim: true
},
media: [postMediaSchema],
tags: [String]
});
// Users and posts relation schema
const postWatchHistory = new Schema({
userId: {
type: Schema.Types.ObjectId,
ref:'users',
},
postId: {
type: Schema.Types.ObjectId,
ref:'posts',
},
});
// Post liked history schema
const postLikedHistory = new Schema({
userId: {
type: Schema.Types.ObjectId,
ref:'users',
},
postId: {
type: Schema.Types.ObjectId,
ref:'posts',
},
});
// Post comment history schema
const postCommentHistory = new Schema({
userId: {
type: Schema.Types.ObjectId,
ref:'users',
},
postId: {
type: Schema.Types.ObjectId,
ref:'posts',
},
text:{
type: String,
required: true,
trim: true
},
status:{
type: String,
enum:['Y', 'N'],
default:'N',
trim: true
}
});