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https://github.com/thoughtbot/factory_girl_rails

Factory Bot ♥ Rails
https://github.com/thoughtbot/factory_girl_rails

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Factory Bot ♥ Rails

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# factory_bot_rails [![Code Climate][grade-image]][grade] [![Gem Version][version-image]][version]



[factory_bot][fb] 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.



### Transitioning from factory\_girl\_rails?



Check out the [guide](https://github.com/thoughtbot/factory_bot/blob/4-9-0-stable/UPGRADE_FROM_FACTORY_GIRL.md).



## Rails



factory\_bot\_rails provides Rails integration for [factory_bot][fb].



Supported Rails versions are listed in [`Appraisals`](Appraisals). Supported

Ruby versions are listed in [`.github/workflows/build.yml`](.github/workflows/build.yml).



## Download



Github: http://github.com/thoughtbot/factory_bot_rails



Gem:



    $ gem install factory_bot_rails



## Configuration



Add `factory_bot_rails` to your Gemfile in both the test and development groups:



```ruby

group :development, :test do

  gem 'factory_bot_rails'

end

```



You may want to configure your test suite to include factory\_bot methods; see

[configuration](https://github.com/thoughtbot/factory_bot/blob/main/GETTING_STARTED.md#configure-your-test-suite).



### Automatic Factory Definition Loading



By default, factory\_bot\_rails will automatically load factories

defined in the following locations,

relative to the root of the Rails project:



```

factories.rb

test/factories.rb

spec/factories.rb

factories/*.rb

test/factories/*.rb

spec/factories/*.rb

```



You can configure by adding the following to `config/application.rb` or the

appropriate environment configuration in `config/environments`:



```ruby

config.factory_bot.definition_file_paths = ["custom/factories"]

```



This will cause factory\_bot\_rails to automatically load factories in

`custom/factories.rb` and `custom/factories/*.rb`.



It is possible to use this setting to share factories from a gem:



```rb

begin

  require 'factory_bot_rails'

rescue LoadError

end



class MyEngine < ::Rails::Engine

  config.factory_bot.definition_file_paths +=

    [File.expand_path('../factories', __FILE__)] if defined?(FactoryBotRails)

end

```



You can also disable automatic factory definition loading entirely by

using an empty array:



```rb

config.factory_bot.definition_file_paths = []

```



### Generators



Including factory\_bot\_rails in the development group of your Gemfile

will cause Rails to generate factories instead of fixtures.

If you want to disable this feature, you can either move factory\_bot\_rails out

of the development group of your Gemfile, or add the following configuration:



```ruby

config.generators do |g|

  g.factory_bot false

end

```



If fixture replacement is enabled and you already have a `test/factories.rb`

file (or `spec/factories.rb` if using rspec_rails), generated factories will be

inserted at the top of the existing file.

Otherwise, factories will be generated in the

`test/factories` directory (`spec/factories` if using rspec_rails),

in a file matching the name of the table (e.g. `test/factories/users.rb`).



To generate factories in a different directory, you can use the following

configuration:



```ruby

config.generators do |g|

  g.factory_bot dir: 'custom/dir/for/factories'

end

```



Note that factory\_bot\_rails will not automatically load files in custom

locations unless you add them to `config.factory_bot.definition_file_paths` as

well.



The suffix option allows you to customize the name of the generated file with a

suffix:



```ruby

config.generators do |g|

  g.factory_bot suffix: "factory"

end

```



This will generate `test/factories/users_factory.rb` instead of

`test/factories/users.rb`.



For even more customization, use the `filename_proc` option:



```ruby

config.generators do |g|

  g.factory_bot filename_proc: ->(table_name) { "prefix_#{table_name}_suffix" }

end

```



To override the [default factory template][], define your own template in

`lib/templates/factory_bot/model/factories.erb`. This template will have

access to any methods available in `FactoryBot::Generators::ModelGenerator`.

Note that factory\_bot\_rails will only use this custom template if you are

generating each factory in a separate file; it will have no effect if you are

generating all of your factories in `test/factories.rb` or `spec/factories.rb`.



Factory\_bot\_rails will add a custom generator:



```shell

rails generate factory_bot:model NAME [field:type field:type] [options]

```



[default factory template]: https://github.com/thoughtbot/factory_bot_rails/tree/main/lib/generators/factory_bot/model/templates/factories.erb



## Contributing



Please see [CONTRIBUTING.md](CONTRIBUTING.md).



factory_bot_rails was originally written by Joe Ferris and is maintained by thoughtbot. Many improvements and bugfixes were contributed by the [open source

community](https://github.com/thoughtbot/factory_bot_rails/graphs/contributors).



## License



factory_bot_rails is Copyright © 2008 Joe Ferris and thoughtbot. It is free

software, and may be redistributed under the terms specified in the

[LICENSE](LICENSE) file.



## About thoughtbot



![thoughtbot](https://thoughtbot.com/thoughtbot-logo-for-readmes.svg)



This repo 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][community].

We are [available for hire][hire].



[community]: https://thoughtbot.com/community?utm_source=github

[hire]: https://thoughtbot.com/hire-us?utm_source=github



[fb]: https://github.com/thoughtbot/factory_bot

[grade]: https://codeclimate.com/github/thoughtbot/factory_bot_rails

[grade-image]: https://codeclimate.com/github/thoughtbot/factory_bot_rails.svg

[community]: https://thoughtbot.com/community?utm_source=github

[hire]: https://thoughtbot.com/hire-us?utm_source=github

[version-image]: https://badge.fury.io/rb/factory_bot_rails.svg

[version]: https://badge.fury.io/rb/factory_bot_rails

[hound-image]: https://img.shields.io/badge/Reviewed_by-Hound-8E64B0.svg

[hound]: https://houndci.com