myApp.js

require("dotenv").config();
const mongoose = require("mongoose");

mongoose.connect(process.env.MONGO_URI, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

const Schema = mongoose.Schema;

const personSchema = new Schema({
  name: { type: String, required: true },
  age: Number,
  favoriteFoods: [String],
});

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

const createAndSavePerson = async (done) => {
  const person = await Person.create({
    name: "John",
    age: 25,
    favoriteFoods: ["Pizza", "Burger"],
  });
  person.save((err, data) => {
    if (err) return console.error(err);
    done(null, data);
  });
};

const createManyPeople = (arrayOfPeople, done) => {
  Person.create(arrayOfPeople, (err, data) => {
    if (err) return console.error(err);
    done(null, data);
  });
};

const findPeopleByName = (personName, done) => {
  Person.find({ name: personName }, (err, data) => {
    if (err) return console.error(err);
    done(null, data);
  });
};

const findOneByFood = (food, done) => {
  Person.findOne({ favoriteFoods: food }, (err, data) => {
    if (err) return console.error(err);
    done(null, data);
  });
};

const findPersonById = (personId, done) => {
  Person.findById(personId, (err, data) => {
    if (err) return console.error(err);
    done(null, data);
  });
};

const findEditThenSave = (personId, done) => {
  const foodToAdd = "hamburger";
  findPersonById(personId, async (err, person) => {
    if (err) return console.error(err);
    person.favoriteFoods.push(foodToAdd);
    try {
      await person.save();
      done(null, person);
    } catch (error) {
      done(error);
    }
  });
};

const findAndUpdate = (personName, done) => {
  const ageToSet = 20;
  Person.findOneAndUpdate(
    { name: personName },
    { age: ageToSet },
    { new: true },
    (err, person) => {
      if (err) return console.error(err);
      done(null, person);
    }
  );
};

var removeById = function (personId, done) {
  Person.findByIdAndRemove(personId, (err, removedPerson) => {
    if (err) return console.log(err);
    done(null, removedPerson);
  });
};

const removeManyPeople = (done) => {
  const nameToRemove = "Mary";
  Person.remove({ name: nameToRemove }, (err, outcome) => {
    if (err) return console.error(err);
    done(null, outcome);
  });
};

const queryChain = (done) => {
  const foodToSearch = "burrito";
  Person.find({ favoriteFoods: foodToSearch })
    .sort({ name: 1 })
    .limit(2)
    .select("-age")
    .exec(done);
};

/** **Well Done !!**
/* You completed these challenges, let's go celebrate !
 */

//----- **DO NOT EDIT BELOW THIS LINE** ----------------------------------

exports.PersonModel = Person;
exports.createAndSavePerson = createAndSavePerson;
exports.findPeopleByName = findPeopleByName;
exports.findOneByFood = findOneByFood;
exports.findPersonById = findPersonById;
exports.findEditThenSave = findEditThenSave;
exports.findAndUpdate = findAndUpdate;
exports.createManyPeople = createManyPeople;
exports.removeById = removeById;
exports.removeManyPeople = removeManyPeople;
exports.queryChain = queryChain;