Populate Mark Name with airSlate SignNow

Populate mark name

hello everyone in this video we will discuss about how you can link multiple collections in mongodb using node.js and mongoose so this is a basic node.js project i have set up the mongodb using mongodb atlas and i've set up the routes and then the routes communicate to controller and then the controller used models to query data so jump right into the model so first this is the user schema it has all the variables okay and the desired types so we will discuss about a a situation where we create where the user chats with multiple other users a chat box so we have a conversation schema in the conversation schema as you can see like first user id it is actually referencing to the user model okay so the type is actually mongoose.schema.types.object id and reference user say so the second user this is also referencing to the user and then after the conversation there's a model called messages in messages it is referencing to the conversation and the sender id center id is actually referencing to the user schema so this is actually how you do it and the reference this should be the exact spelling that we have specified there like mongoose.model user this and this spelling should be same as you can see the conversation and this conversation this this should be same okay and how you can query them like there are multiple ways you can do it you can use uh aggregation you can use populate statement and one of the easiest way to do is is by using populate statement okay so how you can do is like how you can do it like this is a method i have created like get messages by conversation id you get all the messages uh by providing a conversation id if you only write like messages dot fine what will happen like okay let's see messages dot find conversation id call back sort okay so i opened up the postman this is the api i press ok it's it it finds all the messages like message sender id conversation id message date time okay you get all the data but i want the data of the user as well i i need to know like this is the sender id but i need to know who that sender is like then the person name the person profile picture okay so for that i have used the populate okay populate sender id sender id is actually the sender id is referencing to the model schema referencing user okay so i've used it is very simple like you you have to write dot populate and then in the creations send righty okay and then when i use postman and then here you can see like in center id it gives you the whole object of the sender okay complete details but obviously i don't need all the details i i only need the name...