GiriVakkalanka

const sendgrid = require('sendgrid');
const helper = sendgrid.mail; //don't want to use es6 destructuring b.c we want to call it helper. not mail.
const keys = require('../config/keys');

class Mailer extends helper.Mail {
  //constructor doesnt need to receive a survey model obj.
  //It just has to be an object that has a subject and recipients.
  //the second parameter is the html string, that we'll call content
  //this design lets us use this Mailer for sending more than just surveys
  //this mailer obj is defined here created in the surveyRoutes to send the emails.