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I recently started developing an app for my senior project which requires me to use some type of database. For that I decided to go with Mongoose since it is noSQL and slightly easier to pick up.

So, fast forward and I run into a problem where I can't figure out how to edit an already existing Schema and add new keys into it.

For example, I have this Schema which represents a post(think Tweets or Facebook posts) that holds:

• A string that holds the body of the post


• The id of the user that created the post


• The Date of when the post was created

My code for that is:

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

// Create Schema
const PostsSchema = new Schema(
 Value: 
 type: String,
 required: true
 ,
 User: 
 type: Schema.Types.ObjectId,
 ref:'users'
 ,
 Date: 
 type: Date,
 default: Date.now
 
);

// Create collection and add schema
mongoose.model('posts', PostsSchema, 'posts');

What I want now is to access that schema in some way and add a new key to it using something similar to maybe

PostsSchema.add(Private: default: false);

Meaning that, now the schema in the database will look something like:

 "_id": 
 "$oid": "1831g98af21n9s5u7s9ccchj5"
 ,
 "Value": "Beautiful day outside, can't wait to go jogging!",
 "User": 
 "$oid": "9a79ab143lbk9lk55wq327oi3226m"
 ,
 "Date": 
 "$date": "2018-10-29T01:28:44.408Z"
 ,
 "Private": "false"
 "__v": 0

So back to my question, is there any way to do this? Or if you have a link to documentation of such methods I would greatly appreciate it. Thank you Greatly!

Just add the field to the schema with a default:

const PostsSchema = new Schema(
 Value: 
 type: String,
 required: true
 ,
 User: 
 type: Schema.Types.ObjectId,
 ref:'users'
 ,
 Date: 
 type: Date,
 default: Date.now
 ,
 Private: type: Boolean, default: 'false'
);

Since you have a default any new record will have it as well as any new instance of an old model saved before you added the private field.

If you really need more dynamic approach the usual recommendation is using Mixed Type with all the pluses and minuses that come with it.