read/write values of another session

[CaiooAndrade]

Hi, I'm learning about this library. Could I be able to access values from other sessions?
I'm trying like this,

const session = (new LocalSession({ database: 'example_db.json' }));
bot.use(session.middleware());
console.log(session.getSession('170062604:170062604')); //<-- This like gives me the error below
TypeError: Cannot read property '_' of undefined

[TemaSM]

Hi @Iniro,
Thanks for your question!

Short answer:
You are trying to use sessions database synchronously, but it even didn't initialized yet.
Simply set storage type to be synchronous, so your code will looks like:

const session = new LocalSession({
  database: 'example_db.json',
  storage: LocalSession.storageFileSync
})
bot.use(session.middleware());
console.log(session.getSession('170062604:170062604'));

Detailed answer:
As default telegraf-session-local uses asynchronous storage file adapter for lowdb:

telegraf-session-local/lib/session.js

Lines 1 to 6 in 14c0a9f

	const
	debug = require('debug')('telegraf:session-local'),
	lowdb = require('lowdb'),
	storageFileSync = require('lowdb/adapters/FileSync'),
	storageFileAsync = require('lowdb/adapters/FileAsync'),
	storageMemory = require('lowdb/adapters/Memory')

telegraf-session-local/lib/session.js

Lines 24 to 27 in 14c0a9f

	class LocalSession {
	constructor (options = {}) {
	this.options = Object.assign({
	storage: LocalSession.storageFileAsync,

And there's a little bug - we cannot use sessions database before it actually initialized.
Meanwhile I'm working on telegraf-session-local, you can simply set storage type to be synchronous, like:

const session = new LocalSession({
  database: 'example_db.json',
  storage: LocalSession.storageFileSync
})

It's not so easy to keep code backward compatible, but I will try to introduce in v0.0.6 something new on how to deal with asynchronous adapters.

[CaiooAndrade]

Thank you, your response was extremely helpful.

[TemaSM]

@Iniro now you can access database (and sessions in it) in two ways:

1. Synchronous storage (LocalSession.storageFileSync - default storage adapter since v0.0.6):

const session = new LocalSession()
bot.use(session.middleware())
console.log(session.getSession('170062604:170062604'))

2. Asynchronous storage (LocalSession.storageFileAsync):

const session = new LocalSession({
  storage: LocalSession.storageFileAsync,
})
bot.use(session.middleware())
session.DB.then((db) => {
  console.log(db.get('sessions').getById('170062604:170062604').value())
})