factory-girl

factory-girl is a factory library for Node.js and the browser that is inspired by Factory_girl. It works asynchronously and supports associations and the use of functions for generating attributes.

It started out as a fork of factory-lady, but the fork deviated quite a bit. This module uses an adapter to talk to your models so it can support different ORMs such as Bookshelf, Sequelize, JugglingDB, and Mongoose (and doesn't use throw for errors that might occur during save).

Installation

Node.js:

npm install factory-girl

To use factory-girl in the browser or other JavaScript environments, just include index.js and access window.Factory.

Defining Factories

var factory = require('factory-girl'),
    User    = require('../../app/models/user'),
    Post    = require('../../app/models/post');

var emailCounter = 1;

// define a factory using define()
factory.define('user', User, {
  // define attributes using properties
  state: 'active',
  // ...or functions
  email: function() {
    return 'user' + emailCounter++ + '@demo.com';
  },
  // provide async functions by accepting a callback
  async: function(callback) {
    somethingAsync(callback);
  }
});
factory.build('user', function(err, user) {
  console.log(user.attributes); // => {state: 'active', email: 'user1@demo.com', async: 'foo'}
});

factory.define('comment', Comment, {
  text: 'hello'
});

factory.define('post', Post, {
  // create associations using factory.assoc(model, key)
  // or factory.assoc('user') to return the user object itself.
  user_id: factory.assoc('user', 'id'),
  // create array of associations using factory.assocMany(model, key, num)
  comments: factory.assocMany('comment', 'text', 2)
  subject: 'Hello World',
  // you can refer to other attributes using `this`
  slug: function() {
    return slugify(this.subject);
  }
});
factory.build('post', function(err, post) {
  console.log(post.attributes); // => {user_id: 1, comments: [{ text: 'hello' }, { text: 'hello' }], 
                                // subject: 'Hello World', slug: 'hello-world'}
});

Using Factories

factory.build('post', function(err, post) {
  // post is a Post instance that is not saved
});

factory.build('post', {title: 'Foo', content: 'Bar'}, function(err, post) {
  // build a post and override title and content
});

factory.create('post', function(err, post) {
  // post is a saved Post instance
});

Factory#assoc

You can optionally provide attributes to the associated factory by passing an object as third argument.

Factory#buildMany

Allow you to create a number of models at once.

factory.buildMany('post', 10, function(err, posts) {
  // build 10 posts
});
factory.buildMany('post', [{title: 'Foo'}, {title: 'Bar'}], function(err, posts) {
  // build 2 posts using the specified attributes
});
factory.buildMany('post', [{title: 'Foo'}, {title: 'Bar'}], 10, function(err, posts) {
  // build 10 posts using the specified attributes for the first and second
});
factory.buildMany('post', {title: 'Foo'}, 10, function(err, posts) {
  // build 10 posts using the specified attributes for all of them
});

Factory#createMany

factory.createMany takes the same arguments as buildMany, but returns saved models.

Factory#buildSync

When you have factories that don't use async property functions, you can use buildSync(). Be aware that assoc() is an async function, so it can't be used with buildSync().

var doc = factory.buildSync('post', {title: 'Foo'});

Creating new Factories and Adapters

Adapters provide support for different databases and ORMs.

var anotherFactory = new factory.Factory();
var BookshelfAdapter = require('factory-girl-bookshelf').BookshelfAdapter;
anotherFactory.setAdapter(BookshelfAdapter); // use the Bookshelf adapter

Or use the ObjectAdapter that simply returns raw objects.

var ObjectAdapter = factory.ObjectAdapter;
anotherFactory.setAdapter(ObjectAdapter, 'post'); // use the ObjectAdapter for posts

substantial/factory-girl