---
title: FactoryBot 2.1.0 Brings the Heat
teaser: FactoryBot 2.1.0 has been released.
tags: news,web,testing,open source,factory_girl,factory_bot
author: Josh Clayton
published_on: 2011-09-02
---

Factory Bot has seen a handful of changes over the past six weeks since we
released 2.0.0. Some of the highlights:

## Simple association syntax

```ruby
factory :user do
  name "John doe"
end

factory :post do
  author :factory => :user
end
```

## Traits

```ruby
trait :male do
  gender "Male"
end

trait :admin do
  admin true
end

factory :user do
  factory :male_user,       :traits => [:male]
  factory :admin,           :traits => [:admin]
  factory :male_admin_user, :traits => [:male, :admin]
end
```

## Transient attributes

```ruby
factory :user do
  rockstar(true).ignore
  name { "Johnny#{" Rockstar" if rockstar}" }
end

> FactoryBot.create(:user).name                     # "Johnny Rockstar"
> FactoryBot.create(:user, :rockstar => false).name # "Johnny"
```

## Change associations to build instead of create

```ruby
factory :profile do
  sequence(:username) {|n| "user-#{n}" }
end

factory :user do
  profile :method => :build
end
```

## Factory modification

```ruby
FactoryBot.define do
  factory :user do
    name "John Doe"
    sequence(:email) {|n| "user-#{n}@example.com" }
  end
end

FactoryBot.modify do
  factory :user do
    email { "#{name.downcase.underscore}@example.com" }
  end
end
```

## Factory reloading (handy in a console)

```ruby
FactoryBot.reload # reloads all factories, sequences, and traits
```

Apart from these features, we've ensured that Factory Bot processes different
attributes (static attributes, dynamic attributes) in a reasonable order,
verified it works on Rails 3.1.0, upgraded the test suite to use [Mocha] +
[Bourne] instead of [RR] (we at thoughtbot love Mocha), and a handful of other
handy bug fixes.

Grab [Factory Bot 2.1.0] and make testing easier!

[Bourne]: https://github.com/thoughtbot/bourne
[Factory Bot 2.1.0]: http://rubygems.org/gems/factory_girl/versions/2.1.0
[Mocha]: https://github.com/floehopper/mocha
[RR]: https://github.com/btakita/rr

* * *

**Disclaimer:**

Looking for FactoryGirl? The library was renamed in 2017.
[Project name history can be found here.](https://github.com/thoughtbot/factory_bot/blob/master/NAME.md)