An example of $session getter/setter example

session-getter-example.js

const { runInTransaction } = require('mongoose-transact-utils');
const { User } = require('./models/');

async function someOperationsWithTransaction() {
  let john;
  await runInTransaction(async session => {
    john = await User.findOne({ name: 'John' }).session(session);
    
    // the same session
    console.log(john.$session() === session); // returns true
  });
  
  await runInTransaction(async anotherSession => {
    // you can also change the attached session
    // although be cautious with this approach
    john.$session(anotherSession);
  });
}