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Mongoose

  • it is a mongodb object modeling for nodejs
  • provides a straight-forward, schema-based solution to model your application data
  • it includes built-in type casting, validation, query building, business logic hooks and etc.

Getting started​

  • will be very hard to use this with typescript
const mongoose = require("mongoose");
mongoose.connect("mongodb://localhost/test");

const db = mongoose.connection;
db.on("error", console.error.bind(console, "connection error:"));
db.once("open", function () {
  // we're connected!
});

Schema​

const kittySchema = mongoose.Schema({
  name: String,
});

// add methods, but must be added to the schema before compiling it with mongoose.model()
kittySchema.methods.speak = function () {
  const greeting = this.name
    ? "My name is " + this.name
    : "I don't have a name";
  console.log(greeting);
};

Model​

  • it is a class where we construct documents
const Kitten = mongoose.model("Kitten", kittySchema);

const silence = new Kitten({name: "Silence"});
console.log(silence.name); // Silence

silence.speak(); // My name is Silence

Saving to database​

  • each document can be saved to the database by calling its save method
  • the first argument to the callback will be an error if any occured
silence.save((err, silence) => {
  if (err) return console.error(err);
  silence.speak();
});

Access all specific documents through model​

Kitten.find((err, kittens) => {
  if (err) return console.error(err);
  console.log(kittens);
});

Kitten.find({name: /^Silence/}, callback);