Auth Routes

Base URL /auth

HTTP Method	URL Path	Description
POST	/signup	Signup user
POST	/login	Login user
GET	/verify	Verify Auth token

User routes

Base URL /user

HTTP Method	URL Path	Description
GET	/:user_id	Get user by id
PUT	/edit/:user_id	Get user and edit by id
DELETE	/delete/:user_id	Get user by id and delete

Class routes

Base URL /class

HTTP Method	URL Path	Description
GET	/all	Get all classes
GET	/:class_id	Get class by id
POST	/create	Create a class
POST	/join	Update class with joined members
PUT	/edit/:class_id	Get class and edit by id
DELETE	/delete/:class_id	Get class by id and delete

Hay que hacer tanto populate en la class_id de usuarios como en el user_id de clases.

Class .populate('User')

User .populate('class')

Ambos en un Promise.all se pushean en dos arrays distintos en el join.