For inserting a new document in the collection, we create a object of the schema.
var Auto = require('models/auto')
var autoObj = new Auto({
name: "NewName",
countOf: 10
});
We save it like the following
autoObj.save(function(err, insertedAuto) {
if (err) return console.error(err);
insertedAuto.speak();
// output: Hello this is NewName and I have counts of 10
});
This will insert a new document in the collection