moltyjs

What is moltyjs?

A tiny ODM for MongoDB with multy tenancy support.

NOTE: THIS LIBRARY IS NOT SUITABLE FOR A PRODUCTION ENVIRONMENT, IS STILL UNDER CONSTRUCCTIONS AND MIGTH BE BREAKING CHANGES FROM ONE COMMIT TO ANOTHER. PLEASE, USE IT CAREFULLY AND CHECK THE DOCUMENTATION IN EACH VERSION RELEASE AND THE CHANGELOG. THANK YOU!

Install

$ npm install moltyjs --save

Usage

const { connect } = require('moltys');

// ES2015
import { connect } from ('moltyjs');

Connect to a DB

To connect to a database use the "connect()" function passing trough 'options' payload all the settings required:

Molty.connect(options)

const { connect } = require('moltys');

const options = {
  connection: {
    engine: 'mongodb', // By default
    uri: 'mongodb://localhost:27017/test',
    max: 100, // By default
    min: 1, // By default
  },
  tenants: {
    noListener: false, // By default
    returnNonCachedInstance: false, // By default
  },
};

const connection = connect(options);

"connect()" will return a connection instance which will allow you to perform all the actions availables on the DB.

Note: For the time being MoltyJS only support Mongo Databases.

Drop a DB

.dropDatabase(database)

const res = await connection.dropDatabase('test');
// true

Create a new Schema

Molty Schema are based on Mongoose Schema structure with some changes on the declaration of the inherit schema options. I even keep some field options name to make the Molty integration as easier as posible in those project are currently running Mongoose.

To create a new Schema use the "Schema()" constructor passing the schema and the options:

new Schema(schema, options)

const { Schema } = require('moltys');

const newSchema = Schema(
  {
    email: {
      type: String,
      required: true,
      unique: true,
      maxlength: 100,
    },
    password: {
      type: Number,
      required: true,
    },
    name: {
      type: String,
      default: '',
    },
    age: {
      type: Number,
    },
  },
  {
    timestamps: true,
    inheritOptions: {
      discriminatorKey: '__kind',
    },
  },
);

The schema field properties alowed are:

• type: Mandatory [String, Number, Boolean, Buffer, Date, Array, Object]
• required: Optional {Boolean}
• unique: Optional {Boolean}
• default: Optional
• match: Optional
• enum: Optional
• min: Optional
• max: Optional
• maxlength: Optional
• validate: Optional

And the schema options allowed are:

• timestamps: Optional
• inheritOptions: Optional
  • discriminatorKey: Required once "inheritOptions" is set
  • merge: Optional ['methods', 'preHooks', 'postHooks']

Create a new Model

Once we have created our schema we need to register as a model so we can start to create, find, updete and delete documents. To do this you must provide the a proper schema and a model name. The model name will be the collection name on the DB so use the criteria you want since Molty does not make any accomodation on them like auto plurilize.

new Model(schema, discriminatorName)

const { Model } = require('moltys');

const TestModel = new Model(newSchema, 'TestModel');

Create a Model discriminator

You can also create models which inherits from other models and you can decide in which fashion you wan to do it. You have to make sure that the discriminator key of the child models are the same than the parents and also set what you want to merge from the parent model.

.discriminator(schema, discriminatorName)

const { Schema } = require('moltys');

const newSchemaDiscriminator = Schema(
  {
    job: {
      type: String,
      default: '',
    },
    position: {
      type: String,
    },
  },
  {
    timestamps: true,
    inheritOptions: {
      discriminatorKey: '__kind',
      merge: ['methods', 'preHooks', 'postHooks'],
    },
  },
);

TestModelDiscriminator = TestModel.discriminator(
  newSchemaDiscriminator,
  'TestModelDiscriminator',
);

The merge option must be an array with the element you want to merge from the parent model, teh options are:

• methods: which corresponds to the static methods.
• preHooks: which corresponds to the hooks that are executed before performing actions on the DB
• postHooks: which corresponds to the hooks that are executed after performing actions on the DB

Create a new document

Once we have already set up the Schema and registered the Model with it we can start creating document from that Model as follow:

.new(payload)

const { Model } = require('moltys');

const TestModel = new Model(newSchema, 'TestModel');

newDoc = TestModel.new({
  email: '[e-mail]',
  password: '1321321',
  name: 'Michael Scott',
});

Hooks middleware (Work in progress)

Document middleware is supported for the following document functions.

• save

In document middleware functions, this refers to the document.

Query middleware is supported for the following Model and Query functions.

• update

In query middleware functions, this refers to the query.

Referencing Documents

MoltyJS support referencing document that later on you wil be able to populate on find queries. To make a refference to another Model just add a new field on the Schema with the type ObjectId and the "ref" propertie with the Model name referenciated.

const { Schema } = require('moltys');

const referenceSchema = new Schema(
  {
    email: {
      type: String,
      required: true,
      unique: true,
      maxlength: 100,
    },
    password: {
      type: String,
      required: true,
      unique: true,
      maxlength: 150,
      default: () => crypto.randomBytes(20).toString('hex'),
    },
    accountExpiration: {
      type: Date,
      default: () =>
        moment()
          .add(24, 'hours')
          .utc()
          .format(),
    },
    status: {
      type: String,
      required: true,
      enum: ['pending', 'accepted', 'error'],
      default: 'pending',
    },
    model: {
      type: Schema.types().ObjectId,
      ref: 'TestModel',
    },
  },
  {
    timestamps: true,
  },
);

You can use an array of ObjectId also as type ([ObjectId]). Noticed that to get the proper ObjectId type you must tu get it from the Schema.types() method object is returned.

Saving a document

insertOne(tenant, doc)

const res = await connection.insertOne('tenant_test', newDoc);
// Document || Error

Recovering a document

find(tenant, collection, query = {}, options = {})

• {String} tanant Tenant name
• {String} collection Collection name
• {Object} query Query object
• {Object} options Optional settings
  • {Boolean} moltyClass (true by default) True if you want the results as MoltyJs Document class instead of MongoDB Document
  • {Number} limit (0 by default: no limit) Limit the results to the amount specified
  • {Object} projection (null by default) Create a projection of a field, the projection document limits the fields to return for all matching documents

const resFind = await connection.find('tenant_test', 'TestModel',
{
  name: 'Michael Scott',
},
{
  limit: 1
});
// [Document] || Error

Updating a document

updateOne(tenant, collection, filter, payload, options = {})

const resUpdate = await connection.updateOne(
  'tenant_test',
  'TestModel',
  { name: 'Michael Scott' },
  {
    $set: {
      name: 'Some other name',
    },
  },
);
// {UpdateResult} || Error

Updating a document support all the update operators from MongoDB

Changelog

[0.2.1] - 2017-12-20

Added

• Options 'projection' to just exclude or include specific field in the documents results

Changed

• Documentation about find() method