Mongoose

https://mongoosejs.com/docs/5.x/docs/guide.html

상상 그 이상의 날것

movieApp

index.js

// mongoose

// const mongoose = require('mongoose');

// main().catch(err => console.log(err));

// async function main() {
//   await mongoose.connect('mongodb://localhost:27017/movieApp');

//   // use `await mongoose.connect('mongodb://user:password@localhost:27017/test');` if your database has auth enabled
// }

const mongoose = require('mongoose');
mongoose
  .connect('mongodb://localhost:27017/movieApp', {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() => {
    console.log('CONNECTION OPEN!!!');
  })
  .catch((err) => {
    console.log('OH NO ERROR!!!');
    console.log(err);
  });

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

const movieSchema = new mongoose.Schema({
  title: String,
  year: Number,
  score: Number,
  rating: String,
});

const Movie = mongoose.model('Movie', movieSchema);
// const amadeus = new Movie({
//   title: 'Amadeus',
//   year: 1986,
//   score: 9.2,
//   rating: 'R',
// });

// Movie.insertMany([
//   { title: 'Amelie', year: 2001, score: 8.3, rating: 'R' },
//   { title: 'Alien', year: 1979, score: 8.1, rating: 'R' },
//   { title: 'The Iron Giant', year: 1999, score: 7.5, rating: 'PG' },
//   { title: 'Stan By Me', year: 1986, score: 8.6, rating: 'R' },
//   { title: 'Moonrise Kingdom', year: 2012, score: 7.6, rating: 'PG-13' },
// ]).then((data) => {
//   console.log('IT WORKED!');
//   console.log(data);
// });

terminal:

> amadeus.save()
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 585,
  [Symbol(trigger_async_id_symbol)]: 5,
  [Symbol(destroyed)]: { destroyed: false }
}
> amadeus
{
  title: 'Amadeus',
  year: 1986,
  score: 9.2,
  rating: 'R',
  _id: new ObjectId("6360bc1372e2ac921a72e2d8"),
  __v: 0
}
> amadeus.save()
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 771,
  [Symbol(trigger_async_id_symbol)]: 5,
  [Symbol(destroyed)]: { destroyed: false }
}
> 
(To exit, press Ctrl+C again or Ctrl+D or type .exit)
> 
yeji@Yejiui-MacBookAir codeit % node
Welcome to Node.js v16.15.1.
Type ".help" for more information.
> .load index.js
> CONNECTION OPEN!!!
amadeus
{
  title: 'Amadeus',
  year: 1986,
  score: 9.2,
  rating: 'R',
  _id: new ObjectId("6360bee2e3a860c8d3eb165e")
}
> amadeus
{
  title: 'Amadeus',
  year: 1986,
  score: 9.2,
  rating: 'R',
  _id: new ObjectId("6360bee2e3a860c8d3eb165e")
}
> amadeus.save()
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 368,
  [Symbol(trigger_async_id_symbol)]: 5,
  [Symbol(destroyed)]: { destroyed: false }
}
> amadeus.score = 9.5
9.5
> amadeus.save()
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 537,
  [Symbol(trigger_async_id_symbol)]: 5,
  [Symbol(destroyed)]: { destroyed: false }
}
> 
(To exit, press Ctrl+C again or Ctrl+D or type .exit)
> 
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
IT WORKED!
[
  {
    title: 'Amelie',
    year: 2001,
    score: 8.3,
    rating: 'R',
    _id: new ObjectId("6360ec50077f2f2ccc65b307"),
    __v: 0
  },
  {
    title: 'Alien',
    year: 1979,
    score: 8.1,
    rating: 'R',
    _id: new ObjectId("6360ec50077f2f2ccc65b308"),
    __v: 0
  },
  {
    title: 'The Iron Giant',
    year: 1999,
    score: 7.5,
    rating: 'PG',
    _id: new ObjectId("6360ec50077f2f2ccc65b309"),
    __v: 0
  },
  {
    title: 'Stan By Me',
    year: 1986,
    score: 8.6,
    rating: 'R',
    _id: new ObjectId("6360ec50077f2f2ccc65b30a"),
    __v: 0
  },
  {
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    _id: new ObjectId("6360ec50077f2f2ccc65b30b"),
    __v: 0
  }
]
^C
yeji@Yejiui-MacBookAir codeit % node
Welcome to Node.js v16.15.1.
Type ".help" for more information.
> .load index.js
> CONNECTION OPEN!!!
IT WORKED!
[
  {
    title: 'Amelie',
    year: 2001,
    score: 8.3,
    rating: 'R',
    _id: new ObjectId("6360ed32ae081ab37c697437"),
    __v: 0
  },
  {
    title: 'Alien',
    year: 1979,
    score: 8.1,
    rating: 'R',
    _id: new ObjectId("6360ed32ae081ab37c697438"),
    __v: 0
  },
  {
    title: 'The Iron Giant',
    year: 1999,
    score: 7.5,
    rating: 'PG',
    _id: new ObjectId("6360ed32ae081ab37c697439"),
    __v: 0
  },
  {
    title: 'Stan By Me',
    year: 1986,
    score: 8.6,
    rating: 'R',
    _id: new ObjectId("6360ed32ae081ab37c69743a"),
    __v: 0
  },
  {
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    _id: new ObjectId("6360ed32ae081ab37c69743b"),
    __v: 0
  }
]
> Movie.find({})
Query {
  _mongooseOptions: {},
  _transforms: [],
  _hooks: Kareem { _pres: Map(0) {}, _posts: Map(0) {} },
  _executionStack: null,
  mongooseCollection: Collection {
    collection: Collection { s: [Object] },
    Promise: [Function: Promise],
    modelName: 'Movie',
    _closed: false,
    opts: {
      autoIndex: true,
      autoCreate: true,
      schemaUserProvidedOptions: {},
      capped: false,
      Promise: [Function: Promise],
      '$wasForceClosed': undefined
    },
    name: 'movies',
    collectionName: 'movies',
    conn: NativeConnection {
      base: [Mongoose],
      collections: [Object],
      models: [Object],
      config: {},
      replica: false,
      options: null,
      otherDbs: [],
      relatedDbs: {},
      states: [Object: null prototype],
      _readyState: 1,
      _closeCalled: undefined,
      _hasOpened: true,
      plugins: [],
      id: 0,
      _queue: [],
      _listening: false,
      _connectionString: 'mongodb://localhost:27017/movieApp',
      _connectionOptions: [Object],
      client: [MongoClient],
      '$initialConnection': [Promise],
      db: [Db],
      host: 'localhost',
      port: 27017,
      name: 'movieApp'
    },
    queue: [],
    buffer: false,
    emitter: EventEmitter {
      _events: [Object: null prototype] {},
      _eventsCount: 0,
      _maxListeners: undefined,
      [Symbol(kCapture)]: false
    }
  },
  model: Model { Movie },
  schema: Schema {
    obj: {
      title: [Function: String],
      year: [Function: Number],
      score: [Function: Number],
      rating: [Function: String]
    },
    paths: {
      title: [SchemaString],
      year: [SchemaNumber],
      score: [SchemaNumber],
      rating: [SchemaString],
      _id: [ObjectId],
      __v: [SchemaNumber]
    },
    aliases: {},
    subpaths: {},
    virtuals: { id: [VirtualType] },
    singleNestedPaths: {},
    nested: {},
    inherits: {},
    callQueue: [],
    _indexes: [],
    methods: {},
    methodOptions: {},
    statics: {},
    tree: {
      title: [Function: String],
      year: [Function: Number],
      score: [Function: Number],
      rating: [Function: String],
      _id: [Object],
      __v: [Function: Number],
      id: [VirtualType]
    },
    query: {},
    childSchemas: [],
    plugins: [ [Object], [Object], [Object], [Object], [Object] ],
    '$id': 1,
    mapPaths: [],
    s: { hooks: [Kareem] },
    _userProvidedOptions: {},
    options: {
      typeKey: 'type',
      id: true,
      _id: true,
      validateBeforeSave: true,
      read: null,
      shardKey: null,
      discriminatorKey: '__t',
      autoIndex: null,
      minimize: true,
      optimisticConcurrency: false,
      versionKey: '__v',
      capped: false,
      bufferCommands: true,
      strictQuery: true,
      strict: true,
      pluralization: true
    },
    '$globalPluginsApplied': true,
    _requiredpaths: []
  },
  op: 'find',
  options: {},
  _conditions: {},
  _fields: undefined,
  _update: undefined,
  _path: undefined,
  _distinct: undefined,
  _collection: NodeCollection {
    collection: Collection {
      collection: [Collection],
      Promise: [Function: Promise],
      modelName: 'Movie',
      _closed: false,
      opts: [Object],
      name: 'movies',
      collectionName: 'movies',
      conn: [NativeConnection],
      queue: [],
      buffer: false,
      emitter: [EventEmitter]
    },
    collectionName: 'movies'
  },
  _traceFunction: undefined,
  '$useProjection': true
}
> Movie.find({}).then(data=> console.log(data))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 603,
  [Symbol(trigger_async_id_symbol)]: 601,
  [Symbol(destroyed)]: { destroyed: false }
}
> [
  {
    _id: new ObjectId("6360bee2e3a860c8d3eb165e"),
    title: 'Amadeus',
    year: 1986,
    score: 9.5,
    rating: 'R',
    __v: 0
  },
  {
    _id: new ObjectId("6360ec50077f2f2ccc65b307"),
    title: 'Amelie',
    year: 2001,
    score: 8.3,
    rating: 'R',
    __v: 0
  },
  {
    _id: new ObjectId("6360ec50077f2f2ccc65b308"),
    title: 'Alien',
    year: 1979,
    score: 8.1,
    rating: 'R',
    __v: 0
  },
  {
    _id: new ObjectId("6360ec50077f2f2ccc65b309"),
    title: 'The Iron Giant',
    year: 1999,
    score: 7.5,
    rating: 'PG',
    __v: 0
  },
  {
    _id: new ObjectId("6360ec50077f2f2ccc65b30a"),
    title: 'Stan By Me',
    year: 1986,
    score: 8.6,
    rating: 'R',
    __v: 0
  },
  {
    _id: new ObjectId("6360ec50077f2f2ccc65b30b"),
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    __v: 0
  },
  {
    _id: new ObjectId("6360ed32ae081ab37c697437"),
    title: 'Amelie',
    year: 2001,
    score: 8.3,
    rating: 'R',
    __v: 0
  },
  {
    _id: new ObjectId("6360ed32ae081ab37c697438"),
    title: 'Alien',
    year: 1979,
    score: 8.1,
    rating: 'R',
    __v: 0
  },
  {
    _id: new ObjectId("6360ed32ae081ab37c697439"),
    title: 'The Iron Giant',
    year: 1999,
    score: 7.5,
    rating: 'PG',
    __v: 0
  },
  {
    _id: new ObjectId("6360ed32ae081ab37c69743a"),
    title: 'Stan By Me',
    year: 1986,
    score: 8.6,
    rating: 'R',
    __v: 0
  },
  {
    _id: new ObjectId("6360ed32ae081ab37c69743b"),
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    __v: 0
  }
]
> Movie.find({rating: 'PG-13'}).then(data=> console.log(data))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 935,
  [Symbol(trigger_async_id_symbol)]: 933,
  [Symbol(destroyed)]: { destroyed: false }
}
> [
  {
    _id: new ObjectId("6360ec50077f2f2ccc65b30b"),
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    __v: 0
  },
  {
    _id: new ObjectId("6360ed32ae081ab37c69743b"),
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    __v: 0
  }
]
> Movie.find({year: {$gte: 2010}}).then(data=>console.log(data))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 1500,
  [Symbol(trigger_async_id_symbol)]: 1498,
  [Symbol(destroyed)]: { destroyed: false }
}
> [
  {
    _id: new ObjectId("6360ec50077f2f2ccc65b30b"),
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    __v: 0
  },
  {
    _id: new ObjectId("6360ed32ae081ab37c69743b"),
    title: 'Moonrise Kingdom',
    year: 2012,
    score: 7.6,
    rating: 'PG-13',
    __v: 0
  }
]
> Movie.updateOne({title: 'Amadeus'}, {year: 1984}).then(res => console.log(res)) 
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 3845,
  [Symbol(trigger_async_id_symbol)]: 3843,
  [Symbol(destroyed)]: { destroyed: false }
}
> {
  acknowledged: true,
  modifiedCount: 1,
  upsertedId: null,
  upsertedCount: 0,
  matchedCount: 1
}
> Movie
Model { Movie }
> Movie.updateMany({title: {$in: ['Amadeus', 'Stan By Me']}}, {score:10}).then(res => console.log(res))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 4559,
  [Symbol(trigger_async_id_symbol)]: 4557,
  [Symbol(destroyed)]: { destroyed: false }
}
> {
  acknowledged: true,
  modifiedCount: 3,
  upsertedId: null,
  upsertedCount: 0,
  matchedCount: 3
}
> Movie.findOneAndUpdate({title: 'The Iron Giant'}, {score: 7}).then(m => console.log(m))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 5116,
  [Symbol(trigger_async_id_symbol)]: 5114,
  [Symbol(destroyed)]: { destroyed: false }
}
> {
  _id: new ObjectId("6360ec50077f2f2ccc65b309"),
  title: 'The Iron Giant',
  year: 1999,
  score: 7.5,
  rating: 'PG',
  __v: 0
}
> Movie.findOneAndUpdate({title: 'The Iron Giant'}, {score: 7}, {new: true}).then(m => console.log(m))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 5325,
  [Symbol(trigger_async_id_symbol)]: 5323,
  [Symbol(destroyed)]: { destroyed: false }
}
> {
  _id: new ObjectId("6360ec50077f2f2ccc65b309"),
  title: 'The Iron Giant',
  year: 1999,
  score: 7,
  rating: 'PG',
  __v: 0
}
> Movie.remove({title: 'Amelie'}).then(msg => {console.log(msg)})
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 5790,
  [Symbol(trigger_async_id_symbol)]: 5788,
  [Symbol(destroyed)]: { destroyed: false }
}
> (node:2507) [MONGODB DRIVER] Warning: collection.remove is deprecated. Use deleteOne, deleteMany, or bulkWrite instead.
(Use `node --trace-warnings ...` to show where the warning was created)
{ acknowledged: true, deletedCount: 2 }
> Movie.deleteMany({year: {$gte: 1999}}).then(msg => console.log(msg))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 6152,
  [Symbol(trigger_async_id_symbol)]: 6150,
  [Symbol(destroyed)]: { destroyed: false }
}
> { acknowledged: true, deletedCount: 4 }
> Movie.findOneAndDelete({title: 'Alien'}).then(m => console.log(m))
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 6547,
  [Symbol(trigger_async_id_symbol)]: 6545,
  [Symbol(destroyed)]: { destroyed: false }
}
> {
  _id: new ObjectId("6360ec50077f2f2ccc65b308"),
  title: 'Alien',
  year: 1979,
  score: 8.1,
  rating: 'R',
  __v: 0
}

shopApp

index.js

const mongoose = require('mongoose');
mongoose
  .connect('mongodb://localhost:27017/shopApp', {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() => {
    console.log('CONNECTION OPEN!!!');
  })
  .catch((err) => {
    console.log('OH NO ERROR!!!');
    console.log(err);
  });

const productSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true,
    maxlength: 20,
  },
  price: {
    type: Number,
    required: true,
    min: [
      0,
      'Price must be positive ya dodo!', // 에러발생 시 콘솔에서 출력되는 메세지
    ],
  },
  onSale: {
    type: Boolean,
    default: false,
  },
  categories: [String],
  qty: {
    online: {
      type: Number,
      default: 0,
    },
    inStore: {
      type: Number,
      default: 0,
    },
  },
  size: {
    type: String,
    enum: ['S', 'M', 'L'],
  },
});

// productSchema.methods.greet = function () {
//   console.log('Hello!!!!! HI!!!!!!!!');
//   console.log(`- from ${this.name}`);
// };

productSchema.methods.toggleOnsale = function () {
  this.onSale = !this.onSale;
  return this.save();
};

productSchema.methods.addCategory = function (newCat) {
  this.categories.push(newCat);
  return this.save();
};

productSchema.statics.fireSale = function () {
  return this.updateMany({}, { onSale: true, price: 0 });
};

const Product = mongoose.model('Product', productSchema);

const findProduct = async () => {
  const foundProduct = await Product.findOne({ name: 'Mountain Bike' });
  console.log(foundProduct);
  await foundProduct.toggleOnsale();
  console.log(foundProduct);
  await foundProduct.addCategory('Outdoors');
  console.log(foundProduct);
  // foundProduct.onSale = !foundProduct.onSale;
  // foundProduct.save();
};

Product.fireSale().then((res) => console.log(res));

// findProduct();

// --- Create ---

// const bike = new Product({
//   name: 'Cycling JerSey',
//   price: 25.8,
//   categories: ['Cycling'],
//   size: 'XS',
// });
// bike
//   .save()
//   .then((data) => {
//     console.log('IT WORKED!');
//     console.log(data);
//   })
//   .catch((err) => {
//     console.log('OH NO ERROR!');
//     // console.log(err.errors.name.properties.message);
//     console.log(err);
//   });

// --- Update ---

// Product.findOneAndUpdate(
//   { name: 'Tire Pump' },
//   { price: -100 },
//   { new: true, runValidators: true } // runValidators: true 적지 않으면 유효성 검사 없이 변경됨
// )
//   .then((data) => {
//     console.log('IT WORKED!');
//     console.log(data);
//   })
//   .catch((err) => {
//     console.log('OH NO ERROR!');
//     console.log(err);
//   });

terminal:

...
internal/console/constructor:324:14)
    at console.log (node:internal/console/constructor:360:61)
    at /Users/yeji/Development/codeit/index.js:49:13
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  errors: {
    'categories.2': CastError: Cast to [string] failed for value "[ 'Cycling', 'Safety', [] ]" (type string) at path "categories.2" because of "CastError"
        at SchemaArray.cast (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schema/array.js:389:15)
        at SchemaArray.SchemaType.applySetters (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schematype.js:1201:12)
        at model.$set (/Users/yeji/Development/codeit/node_modules/mongoose/lib/document.js:1410:22)
        at model.$set (/Users/yeji/Development/codeit/node_modules/mongoose/lib/document.js:1135:16)
        at model.Document (/Users/yeji/Development/codeit/node_modules/mongoose/lib/document.js:166:12)
        at model.Model (/Users/yeji/Development/codeit/node_modules/mongoose/lib/model.js:121:12)
        at new model (/Users/yeji/Development/codeit/node_modules/mongoose/lib/model.js:5032:15)
        at Object.<anonymous> (/Users/yeji/Development/codeit/index.js:35:14)
        at Module._compile (node:internal/modules/cjs/loader:1105:14)
        at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10) {
      stringValue: `"[ 'Cycling', 'Safety', [] ]"`,
      messageFormat: undefined,
      kind: '[string]',
      value: "[ 'Cycling', 'Safety', [] ]",
      path: 'categories.2',
      reason: [CastError],
      valueType: 'string'
    }
  },
  _message: 'Product validation failed'
}
CONNECTION OPEN!!!
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
IT WORKED!
{
  name: 'Bike Helmet',
  price: 19.5,
  onSale: false,
  categories: [ 'Cycling', 'Safety' ],
  qty: { online: 0, inStore: 0 },
  _id: new ObjectId("636106607a6be7a9eb7a4e57"),
  __v: 0
}
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
IT WORKED!
{
  name: 'Tire Pump',
  price: 15.8,
  onSale: false,
  categories: [ 'Cycling' ],
  qty: { online: 0, inStore: 0 },
  _id: new ObjectId("636106d0972b2026fb05aba6"),
  __v: 0
}
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
IT WORKED!
{
  qty: { online: 0, inStore: 0 },
  _id: new ObjectId("636106d0972b2026fb05aba6"),
  name: 'Tire Pump',
  price: 100,
  onSale: false,
  categories: [ 'Cycling' ],
  __v: 0
}
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
IT WORKED!
{
  qty: { online: 0, inStore: 0 },
  _id: new ObjectId("636106d0972b2026fb05aba6"),
  name: 'Tire Pump',
  price: -100,
  onSale: false,
  categories: [ 'Cycling' ],
  __v: 0
}
^C
yeji@Yejiui-MacBookAir codeit % node index
OH NO ERROR!
Error: Validation failed: price: Path `price` (-100) is less than minimum allowed value (0).
    at ValidationError.inspect (/Users/yeji/Development/codeit/node_modules/mongoose/lib/error/validation.js:50:26)
    at formatValue (node:internal/util/inspect:782:19)
    at inspect (node:internal/util/inspect:347:10)
    at formatWithOptionsInternal (node:internal/util/inspect:2167:40)
    at formatWithOptions (node:internal/util/inspect:2029:10)
    at console.value (node:internal/console/constructor:324:14)
    at console.log (node:internal/console/constructor:360:61)
    at /Users/yeji/Development/codeit/index.js:73:13
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  errors: {
    price: ValidatorError: Path `price` (-100) is less than minimum allowed value (0).
        at validate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schematype.js:1346:13)
        at SchemaNumber.SchemaType.doValidate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schematype.js:1330:7)
        at /Users/yeji/Development/codeit/node_modules/mongoose/lib/helpers/updateValidators.js:151:22
        at module.exports (/Users/yeji/Development/codeit/node_modules/mongoose/lib/helpers/updateValidators.js:202:7)
        at /Users/yeji/Development/codeit/node_modules/mongoose/lib/query.js:4314:9
        at promiseOrCallback (/Users/yeji/Development/codeit/node_modules/mongoose/lib/helpers/promiseOrCallback.js:11:14)
        at model.Query.validate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/query.js:4309:10)
        at /Users/yeji/Development/codeit/node_modules/kareem/index.js:426:25
        at processTicksAndRejections (node:internal/process/task_queues:78:11) {
      properties: [Object],
      kind: 'min',
      path: 'price',
      value: -100,
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    }
  },
  _message: 'Validation failed'
}
CONNECTION OPEN!!!
^C  
yeji@Yejiui-MacBookAir codeit % 
yeji@Yejiui-MacBookAir codeit % node index
OH NO ERROR!
Error: Validation failed: price: Price must be positive ya dodo!
    at ValidationError.inspect (/Users/yeji/Development/codeit/node_modules/mongoose/lib/error/validation.js:50:26)
    at formatValue (node:internal/util/inspect:782:19)
    at inspect (node:internal/util/inspect:347:10)
    at formatWithOptionsInternal (node:internal/util/inspect:2167:40)
    at formatWithOptions (node:internal/util/inspect:2029:10)
    at console.value (node:internal/console/constructor:324:14)
    at console.log (node:internal/console/constructor:360:61)
    at /Users/yeji/Development/codeit/index.js:73:13
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  errors: {
    price: ValidatorError: Price must be positive ya dodo!
        at validate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schematype.js:1346:13)
        at SchemaNumber.SchemaType.doValidate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schematype.js:1330:7)
        at /Users/yeji/Development/codeit/node_modules/mongoose/lib/helpers/updateValidators.js:151:22
        at module.exports (/Users/yeji/Development/codeit/node_modules/mongoose/lib/helpers/updateValidators.js:202:7)
        at /Users/yeji/Development/codeit/node_modules/mongoose/lib/query.js:4314:9
        at promiseOrCallback (/Users/yeji/Development/codeit/node_modules/mongoose/lib/helpers/promiseOrCallback.js:11:14)
        at model.Query.validate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/query.js:4309:10)
        at /Users/yeji/Development/codeit/node_modules/kareem/index.js:426:25
        at processTicksAndRejections (node:internal/process/task_queues:78:11) {
      properties: [Object],
      kind: 'min',
      path: 'price',
      value: -100,
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    }
  },
  _message: 'Validation failed'
}
CONNECTION OPEN!!!
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
IT WORKED!
{
  name: 'Cycling JerSey',
  price: 25.8,
  onSale: false,
  categories: [ 'Cycling' ],
  qty: { online: 0, inStore: 0 },
  _id: new ObjectId("636110d1a741f29a5457bd4b"),
  __v: 0
}
^C
yeji@Yejiui-MacBookAir codeit % node index
OH NO ERROR!
Error: Product validation failed: size: `XS` is not a valid enum value for path `size`.
    at ValidationError.inspect (/Users/yeji/Development/codeit/node_modules/mongoose/lib/error/validation.js:50:26)
    at formatValue (node:internal/util/inspect:782:19)
    at inspect (node:internal/util/inspect:347:10)
    at formatWithOptionsInternal (node:internal/util/inspect:2167:40)
    at formatWithOptions (node:internal/util/inspect:2029:10)
    at console.value (node:internal/console/constructor:324:14)
    at console.log (node:internal/console/constructor:360:61)
    at /Users/yeji/Development/codeit/index.js:67:13
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  errors: {
    size: ValidatorError: `XS` is not a valid enum value for path `size`.
        at validate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schematype.js:1346:13)
        at SchemaString.SchemaType.doValidate (/Users/yeji/Development/codeit/node_modules/mongoose/lib/schematype.js:1330:7)
        at /Users/yeji/Development/codeit/node_modules/mongoose/lib/document.js:2877:18
        at processTicksAndRejections (node:internal/process/task_queues:78:11) {
      properties: [Object],
      kind: 'enum',
      path: 'size',
      value: 'XS',
      reason: undefined,
      [Symbol(mongoose:validatorError)]: true
    }
  },
  _message: 'Product validation failed'
}
CONNECTION OPEN!!!
^C
> node
> .load index.js
> const p = new Product({name: 'bike bag', price: 10}) 
undefined
> p
{
  name: 'bike bag',
  price: 10,
  onSale: false,
  categories: [],
  qty: { online: 0, inStore: 0 },
  _id: new ObjectId("636112295b107c3b203db7a6")
}
> p.greet
[Function (anonymous)]
> p.greet()
Hello!!!!! HI!!!!!!!!
undefined
> 
(To exit, press Ctrl+C again or Ctrl+D or type .exit)
> 
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
Hello!!!!! HI!!!!!!!!
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
Hello!!!!! HI!!!!!!!!
- from Bike Helmet
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
Hello!!!!! HI!!!!!!!!
- from Mountain Bike
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
{
  qty: { online: 0, inStore: 0 },
  onSale: false,
  categories: [],
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 0
}
{
  qty: { online: 0, inStore: 0 },
  onSale: true,
  categories: [],
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 1
}
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
{
  qty: { inStore: 0, online: 0 },
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 1,
  categories: [],
  onSale: true
}
{
  qty: { inStore: 0, online: 0 },
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 1,
  categories: [],
  onSale: false
}
{
  qty: { inStore: 0, online: 0 },
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 2,
  categories: [ 'Outdoors' ],
  onSale: false
}
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
{
  qty: { inStore: 0, online: 0 },
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 2,
  categories: [ 'Outdoors' ],
  onSale: false
}
{
  qty: { inStore: 0, online: 0 },
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 2,
  categories: [ 'Outdoors' ],
  onSale: true
}
{
  qty: { inStore: 0, online: 0 },
  _id: new ObjectId("636101d66ce68ea77c61b25e"),
  name: 'Mountain Bike',
  price: 999,
  __v: 3,
  categories: [ 'Outdoors', 'Outdoors' ],
  onSale: true
}
^C
yeji@Yejiui-MacBookAir codeit % node index
CONNECTION OPEN!!!
{
  acknowledged: true,
  modifiedCount: 9,
  upsertedId: null,
  upsertedCount: 0,
  matchedCount: 9
}

터미널이 잘리는구나,,,

about "VIRTUAL"

person.js

const mongoose = require('mongoose');
mongoose
  .connect('mongodb://localhost:27017/shopApp', {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() => {
    console.log('CONNECTION OPEN!!!');
  })
  .catch((err) => {
    console.log('OH NO ERROR!!!');
    console.log(err);
  });

const personSchema = new mongoose.Schema({
  first: String,
  last: String,
});

personSchema.virtual('fullName').get(function () {
  return `${this.first} ${this.last}`;
});

personSchema.pre('save', async function () {
  this.first = 'YO';
  this.last = 'MAMA';
  console.log('ABOUT TO SAVE!!!');
});

personSchema.post('save', async function () {
  console.log('JUST SAVED!!!');
});

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

terminal:

> const tammy = new Person({first: 'Tammy', last:'Chow'})
undefined
> tammy
{
  first: 'Tammy',
  last: 'Chow',
  _id: new ObjectId("6361223a3f91798e85ec31da")
}
> tammy.save(
... 
... )
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 703,
  [Symbol(trigger_async_id_symbol)]: 5,
  [Symbol(destroyed)]: { destroyed: false }
}
> tammy.fullName
'Tammy Chow'
> tammy.fullName
'Tammy Chow'
> tammy.fullName = 'Tammy Xiao'
'Tammy Xiao'
> tammy.save()
Promise {
  <pending>,
  [Symbol(async_id_symbol)]: 1121,
  [Symbol(trigger_async_id_symbol)]: 5,
  [Symbol(destroyed)]: { destroyed: false }
}
> tammy.fullName
'Tammy Chow'
>