mongoose.js

const mongoose = require("mongoose");
const { Schema } = mongoose;

const url = "mongodb://localhost:27017/goji";

mongoose.connect(url, { useNewUrlParser: true, useUnifiedTopology: true });

function connect() {
  return new Promise((resolve, reject) => {
    const db = mongoose.connection;
    db.on("error", (error) => {
      console.error("connection error:", error);
      reject();
    });
    db.once("open", function () {
      // we're connected!
      resolve();
    });
  });
}

async function main() {
  await connect();

  const personSchema = Schema({
    name: String,
    age: Number,
    stories: [{ type: Schema.Types.ObjectId, ref: "Story" }],
  });

  const storySchema = Schema({
    author: { type: Schema.Types.ObjectId, ref: "Person" },
    title: String,
    fans: [{ type: Schema.Types.ObjectId, ref: "Person" }],
  });

  const Story = mongoose.model("Story", storySchema);
  const Person = mongoose.model("Person", personSchema);

  let david = new Person({ name: "David", age: 31 });
  let story = new Story({ author: david, title: "Running code" });
  // await david.save();
  console.log(david, story);

  mongoose.disconnect();

  // const Cat = mongoose.model("Cat", { name: String });

  // const kitty = new Cat({ name: "Zildjian" });

  // await kitty.save();

  // console.log("meow");
}

main();