RidgeA

Do not declare methods using ES6 arrow functions (=>). Arrow functions explicitly prevent binding this, so your method will not have access to the document and the above examples will not work.

app.use(passport.initialize());
  app.use(passport.session());

db.collection("customers").find({ id: { $in: [ 390, 754, 454 ] } }, { _id: 0, name: 1 })