factory-girl

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.

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.

Usage

var factory = require('factory-girl');
var User    = require('../models/user');

factory.define('user', User, {
  username: 'Bob',
  score: 50,
});

factory.build('user', function(err, user) {
  console.log(user.attributes);
  // => {username: 'Bob', score: 50}
});

Defining Factories

var factory = require('factory-girl');
var User    = require('../models/user');

factory.define('user', User, {
  email: factory.sequence(function(n) {
    return 'user' + n + '@demo.com';
  }),
  // async functions can be used by accepting a callback as an argument
  async: function(callback) {
    somethingAsync(callback);
  },
  // you can refer to other attributes using `this`
  username: function() {
    return this.email;
  }
});
factory.build('user', function(err, user) {
  console.log(user.attributes);
  // => {state: 'active', email: '[e-mail]', async: 'foo', username: '[e-mail]'}
});

Options

Options can be provided when you define a model:

factory.define('user', User, { foo: 'bar' }, options);

Alternatively you can create a new factory that specifies options for all of its models:

var builder = factory.withOptions(options);

Currently the supported options are:

afterBuild: function(instance, attrs, callback)

Provides a function that is called after the model is built.

afterCreate: function(instance, attrs, callback)

Provides a function that is called after a new model instance is saved.

factory.define('user', User, {
  foo: 'bar'
}, {
  afterCreate: function(instance, attrs, callback) {
    generateBazBasedOnID(instance.id, function(error, generatedBaz) {
      if(error) {
        callback(error, null);
      } else {
        instance.baz = generatedBaz;
        callback(null, instance);
      }
    });
  }
});

Other builder options can be accessed, inside hooks, using this.options.

Defining Associations

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)
});
factory.build('post', function(err, post) {
  console.log(post.attributes);
  // => { user_id: 1, comments: [{ text: 'hello' }, { text: 'hello' }] }
});

Defining Sequences

factory.define('post', Post, {
  // Creates a new sequence that returns the next number in the sequence for
  // each created instance, starting with 1.
  num: factory.sequence(),
  // factory.sequence can be abbreviated as factory.seq
  email: factory.seq(function(n) {
    return 'email' + n + '@test.com';
  }),
  // Can also be async
  asyncProp: factory.seq(function(n, callback) {
    somethingAsync(n, callback);
  })
});

Using Factories

Factory#attrs

Generates and returns attrs.

factory.attrs('post', function(err, postAttrs) {
  // postAttrs is a post attributes
  console.log(postAttrs);
  // => {title: 'Hello', authorEmail: '[e-mail]'}
});

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

Factory#build

Creates a new (unsaved) instance.

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

Builds and saves a new instance.

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'});

Factory#cleanup

Destroys all of the created models. This is done using the adapter's destroy method.

Adapters

Adapters provide support for different databases and ORMs. Adapters can be registered for specific models, or as the 'default adapter', which is used for any models for which an adapter has not been specified. See the adapter docs for usage, but typical usage is:

// use the bookshelf adapter as the default adapter
require('factory-girl-bookshelf')();

ObjectAdapter

You can use the included ObjectAdapter to work without model classes. This adapter simply returns the provided attribute objects.

factory.setAdapter(new factory.ObjectAdapter());

Using Different Adapters Per-model

// use an ObjectAdapter for the `post` model only
factory.setAdapter(new factory.ObjectAdapter(), 'post');

Creating new Factories

You can create multiple factories which have different settings:

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

Like Promises?

Me too! Bluebird and q are both supported:

var bluebird = require('bluebird');
var factory = require('factory-girl').promisify(bluebird);

History

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).

License

Copyright (c) 2014 Simon Wade. This software is licensed under the MIT License. Copyright (c) 2011 Peter Jihoon Kim. This software is licensed under the MIT License.