Mongoose creating Database without any Record/document

Working with Data Node.js Frameworks
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1

I read in official documentation on MongoDB that

MongoDB only creates the database when you first store data in that database.

I created database using mongosh and found it to be true. Now I am trying to create database using mongoose module in Nodejs. I am just creating database and not adding any records.
This is my code

const mongoose = require('mongoose');

require('dotenv').config();

const itemadd = require("./model/schema.js")   // Js file having schema 

async function start()
{
    try {
        
      await  mongoose.connect(process.env.mongo_uri)   // line ABC 
        console.log("We are successful")
    } catch (error) {
        console.log("We encountered an error :-\n",error)
    }

}

start();

Now in this piece of code I am just connecting to my server at atlas in line ABC. However upon checking the atlas I am seeing that the database has been created with collection inside it (collection name as per given in schema). Although there is no document/record in it , but still database has been created.
Can anyone tell me how without any record, database was created.

2

ODM does ODM things.

Could also depend on your model, if there is an indexed field (other than _id) then creating the index will create the namespace (database and collection).

// no test db 
s0 [direct: primary] test> show dbs
admin   172.00 KiB
config  164.00 KiB
local   556.00 KiB

// Create an index in test.foo
s0 [direct: primary] test> db.test.foo.createIndex({a:1})
a_1

// Hello database test
s0 [direct: primary] test> show dbs
admin   172.00 KiB
config  164.00 KiB
local   556.00 KiB
test     12.00 KiB
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