Mongoose Simple Decorator

With mongoose, you have to define a schema and model. In addition, if you want to use a type for a Typescript project you also have to define a type. Therefore, if you change something in the type you must change it in the schema. The solution, have the type and the schema together

Problem

import * as mongoose from 'mongoose'
import { Schema, Document } from 'mongoose'

/**
 * Definition of the BasicType
 */
type UserType = {
	...
}

/**
 * Schema
 */
const UserSchema = new Schema({
	...
})

/**
 * Model
 */
var IdModel = mongoose.model('User', UserSchema)

Solution

import { Schema, Field } from 'mongoose-simple-decorator'

@Schema()
class User {
  _id: string

  @Field({ type: String, required: true })
  username: string
}

Install

yarn add mongoose-simple-decorator

npm i mongoose-simple-decorator

Usage

Class Definition

Declare a class with the Schema decorator. It's going to add the schema and the model using Reflect library. Define id property, it's the ObjectId string representation.

@Schema()
class User {
  public id: string
}

Properties or Fields

Declare the properties with the Field decorator. It's going to add properties to the schema. The type of the Field's params are the same as the schema properties.

@Schema()
class User {
  _id: string

  @Field({ type: String, required: true })
  username: string
}

Middleware

Declare the middlewares as private, static, property. private to make it invisible to the rest of the application, static to make it accesible to the Schema decorator and property to assign the Middleware Function Type

@Schema()
class User {
  _id: string

  @Field({ type: String, required: true })
  username: string

  @Field({ type: String, required: true })
  password: string

  @PreHook('save')
  private static encryptPassword: FuncMongooseMiddleware.DocumentRef<User> = (_this, next) => {
    ...
  }
}

Saving the Document

const user = new User()

// do stuff ...

const userDoc = Document(user)
userDoc.save()

The Final Document

// DATABASE.users
{
  "_id":"5b00c2898e5f9f3010d90614",
  "username":"Arthaclarius",
  "password":"ThisIsAVeryLongPassword",
  "age":20,
  "__v":0
}

Overview

// --- User.ts

@Schema()
class User {
  _id: string

  @Field({ type: String, required: true })
  username: string

  @Field({ type: String, required: true })
  password: string

  @PreHook('save')
  private static encryptPassword: FuncMongooseMiddleware.DocumentRef<User> = (_this, next) => {
    _this.password = `encrypt(${_this.password})`
  }
}

// --- Another_Place.ts

// Find
Model(User).find('5b00c2898e5f9f3010d90614')

// Save
const user = new User()
user.username = 'CoolUniqueUserName'
user.password = 'SecurePassword'

Document(user).save()