mongobless
es6 node.js thin mongodb document models ODM
Last updated 3 years ago by ebasley .
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mongobless is a very lite an simple Node.js library to connect to Mongodb and map documents with plain Javascript objects. It's purely schemaless, fully compatible with official Mongo API and made like a toolkit to fit your needs, rather than a full functional framework like Mongoose. It's only a read-only ODM, writes MUST be done manually. You can use it just to connect to Mongo, it may not very useful, but could be efficient : use only one connection, callback or promise API, so easily integrated with node.js. If you look for a thin layer to define models in a non intrusive manner, it will give you the beginning of the answer ...

Last but not the least, Mongobless use es6 and es7 syntax, so you need babel to use it ...

Usage

Define a Model

import mongobless from 'mongobless'

@mogobless({collection: 'models'})
export default class MyModel { 
  // plain es6 class 
  get age(){
    return (new Date()).getFullYear() -  this.birthdayYear;
  }
  
  static doIt(newModel){}

});

Inheritance

"Programming is subcontracting" said B. Meyer beginning of 90's, let's build subtypes, now ... We have to define Piece, Square and Circle types.

import  mongobless from  'mongobless';

@mongobless({collection: 'pieces'})
export class Piece{
  static bless(obj){
    switch(obj.type){
      case 'square':
        return mongobless.bless.bind(Square)(obj);
      case 'circle':
        return mongobless.bless.bind(Circle)(obj);
      default:
        return mongobless.bless.bind(Piece)(obj);
    }
  }
}

@mongobless()
export class Square extends Piece{
  get surface(){
    return this.size * this.size;
  }
    
  constructor(size){
    this.size = size;
    this.type = 'square';
  }
}

@mongobless()
export class Circle extends Piece{
  get surface(){
    return Math.PI * Math.pow(this.radius, 2);
  }

  constructor(radius){
    this.radius = radius;
    this.type = 'circle';
  }
}

mongobless is not very smart, just lite, so to define inheritance, you mainly have to do it manually, but good news, it's very simple and you can do what you want! First, at insert time, always add a type (or whetever name you want) attribute to your documents. In this example domain value must be ['circle', 'square']. Second, at loading time, if you use findOne or findAll, mongobless will call Piece.bless(document) for each document, and depending on document type value, will be blessed to the right type (here Square or Circle). It's clearly an antipattern, for a class to know it's subclasses, but in this context it's so simple, and useful that we will use it !

Connect, Query and Manipule Objects

import mongobless from 'mongobless'
import Mymodel from 'my_model';

mongobless.connect({}, err => {
  if( err) return console.error( "...");
  // Query models collection
  my_model.findOne({ name: 'toto' }, (err, model) => {
    if (err) console.error(err);
    else console.log(model.age)
    mongobless.close();
  });
}

Run your Code

Because of the use of es6, es7 syntaxe you need a transpiler to use it:

  $ babel-node piece.js

API

All API are promisify since version 2.1.0, if you omit callback, a promise will be returned.

Connection

mongobless.connect(options<F5>, cb) | Promise

Create a MongoDB connection, and callback it has result.

  • options Object, passed to mongodb.Server and new mongodb.Db

    • host: server address, default to 127.0.0.1
    • port: server's port, default to 27017
    • auto_reconnectdefault to true
    • poolSize default to 10
    • w default to 1
    • strict default to true
    • native_parser defaut to true
mongobless.findOne( arguments ) | Promise

Use same signature as node-mongodb-native driver. will call redModel.bless(document) on resulting document.

Return only one result, the first if many.

  Piece.findOne({_id: ObjectId("52de8aa97a2731486fdcf8ee")}, (err, piece) => {});
redModel.findAll( arguments ) | Promise

Same as node-mongodb-native#find, but will call redModel.bless(document) on each resulting document.

  Piece.findAll({type: 'square'}, (err, pieces) => {});

In this example, you will extract all squares documents from the collection, resulting documents will be blessed as Square.

Square.findAll() will give you all Pieces, not only Squares. You have to select type manually.

mongobless.collection

Give you direct access to node-mongodb-native driver:

  Piece.collection.insert([new Square(2), new Circle(2)], function(err, res){})

That's all folks ....

Current Tags

  • 2.1.1                                ...           latest (3 years ago)

8 Versions

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