sequelize-singleton

sequelize-singleton

sequelize-singleton is a simple singleton wrapper for the sequelize ORM, making it easier to configure and build models with Sequelize.

• Configuring sequelize-singleton
• Custom Matcher
• Accessing Sequelize
• Defining Models
• Logging

Configuring sequelize-singleton

The sequelize-singleton connect() method accepts the same parameters as the Sequelize() object database, username, password, options. It is important to configure the discover array of the set of paths where your models should be discovered.

// app.js
var orm 		= require('sequelize-singleton');

orm.discover = [__dirname + '/models'];
orm.connect(
  'test-db',
  'test-user',
  'secret1234', 
  {
    dialect: "mysql",
    port:    3306
  });

Upon connect() sequelize-singleton will SYNCHRONOUSLY recurse through all of the subfolders located at the provided file paths looking for any files with the naming default convention *.model.js.

Custom matcher

If you prefer to define your own naming convention instead of the default you can create a custom matching function which receives the file name as the parameter returns a boolean indicating if sequelize-singleton should attempt to load the file as a model.

This function should be attached to matcher like so:

orm.matcher = function(file){
  if(//some condition or regex here)
    return true;
    
  return false;
};

Accessing sequelize

Now you can access the sequelize instance and models wherever you need!

// somefile.js

var orm       = require('sequelize-singleton');
var sequelize = orm.sequelize;
var Sequelize = orm.Sequelize;
var models    = orm.models;
var User      = models.User;

Defining Models

Models are defined as per the suggestion the article here: http://sequelizejs.com/articles/express. All associations are done via the class method associate which is injected with the models object.

// user.model.js
"use strict";

module.exports = function(sequelize, DataTypes) {
  var User = sequelize.define("User", {
    username: DataTypes.STRING
  }, {
    classMethods: {
      associate: function(models) {
        User.hasMany(models.Task)
      }
    }
  });

  return User;
};

Logging

Logging can be turned off by setting orm.logger = false. Additionally, a custom logging function can be defined, which is passed a parameter log. E.g.

orm.logger = function(log){
  //do some sweet logging stuff here
}