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A library for setting up Ruby objects as test data.
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features Rubocop: Fix Style/StringLiterals Offenses (#1216) Oct 8, 2018
gemfiles Test against latest versions of Rails Apr 25, 2019
lib Move and deprecate trait methods from FactoryBot Apr 26, 2019
spec Move and deprecate trait methods from FactoryBot Apr 26, 2019
.gitignore Add rubocop Sep 19, 2018
.hound.yml Ask Hound to use custom .rubocop.yml Oct 7, 2018
.rspec Remove unnecessary spec_helper requires May 21, 2018
.rubocop.yml Arrest lines of an unsavory length Dec 12, 2018
.simplecov Clean up SimpleCov usage Apr 24, 2012
.travis.yml Test against activerecord 6.0 Jan 31, 2019
.yardopts Fix missing docs (#1172) Sep 3, 2018
Appraisals Test against latest versions of Rails Apr 25, 2019 Add standard thoughtbot Sep 8, 2018 Replace 'girl' with 'bot' everywhere (#1051) Oct 20, 2017 Don't rely on DatabaseCleaner for the rake task (#1283) Apr 17, 2019
Gemfile Update development dependencies Jan 5, 2019
Gemfile.lock Bump version to 5.0.2 [ci skip] Feb 22, 2019
LICENSE Update copyright notice to 2019 [ci skip] Feb 8, 2019 Update naming history explanation Oct 24, 2017 Bump version to 5.0.2 [ci skip] Feb 22, 2019 Add useful tools section to README May 17, 2019 Fix Markdown formatting Feb 26, 2019
Rakefile Update Appraisals Oct 31, 2018
cucumber.yml Fixed issues with some attributes being skipped and added support for… Sep 15, 2009
factory_bot.gemspec Bump to version 5.0.1 [ci skip] Feb 15, 2019

factory_bot Build Status Code Climate Gem Version Reviewed by Hound

factory_bot is a fixtures replacement with a straightforward definition syntax, support for multiple build strategies (saved instances, unsaved instances, attribute hashes, and stubbed objects), and support for multiple factories for the same class (user, admin_user, and so on), including factory inheritance.

If you want to use factory_bot with Rails, see factory_bot_rails.

Interested in the history of the project name?

Transitioning from factory_girl?

Check out the guide.


You should find the documentation for your version of factory_bot on Rubygems.

See GETTING_STARTED for information on defining and using factories. We also have a detailed introductory video, available for free on Upcase.


Add the following line to Gemfile:

gem 'factory_bot'

and run bundle install from your shell.

To install the gem manually from your shell, run:

gem install factory_bot

Supported Ruby versions

The factory_bot 5.x series supports MRI Ruby 2.3+.

The factory_bot 3.x+ series supports MRI Ruby 1.9. Additionally, factory_bot 3.6+ supports JRuby while running in 1.9 mode. See GETTING_STARTED for more information on configuring the JRuby environment.

For versions of Ruby prior to 1.9, please use factory_bot 2.x.

More Information

Useful Tools


Please see

factory_bot was originally written by Joe Ferris and is now maintained by Josh Clayton. Many improvements and bugfixes were contributed by the open source community.


factory_bot is Copyright © 2008-2019 Joe Ferris and thoughtbot. It is free software, and may be redistributed under the terms specified in the LICENSE file.

About thoughtbot


factory_bot is maintained and funded by thoughtbot, inc. The names and logos for thoughtbot are trademarks of thoughtbot, inc.

We love open source software! See our other projects or hire us to design, develop, and grow your product.

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