faker-ruby/faker by Vitor Oliveirafaker-ruby/faker by Vitor Oliveira

faker-ruby/faker

Vitor Oliveira

Completed work

Software Engineer

Ruby

Computer Software

Faker

Faker is a port of Perl's Data::Faker library. It's a library for generating fake data such as names, addresses, and phone numbers.

Faker helps you generate realistic test data, and populate your database with more than a couple of records while you're doing development.

It comes in very handy for taking screenshots (taking screenshots for a personal project) and it was the original impetus for the creation of this gem.

Quick links

📖 Read the documentation for the latest version.

📢 See what's changed in recent versions.

In the media

📰 With Great Humor Comes Great Developer Engagement - KTH Royal Institute of Technology research

🎧 Computer und Kommunikation 4.5.2024, komplette Sendung - Deutschland Funk Radio Interview

A note about the Generators versions

Ensuring unique values

Deterministic Random

Customization

Minitest and Faker >= 2.22

Notes

While Faker generates data at random, returned values are not guaranteed to be unique by default. To explicitly specify when you require unique values, see Ensuring Unique Values. Values also can be deterministic if you use the deterministic feature, see Deterministic Random

This is the main branch of Faker and may contain changes that are not yet released. Please refer to the README of your version for the available methods. The list of all versions is available here.

Getting Started

Start by including faker in your Gemfile:

gem 'faker'

Then run bundle install.

Usage

Here are some examples of how to use Faker:

require 'faker'

Faker::Name.name      #=> "Christophe Bartell"

Faker::Address.full_address #=> "5479 William Way, East Sonnyhaven, LA 63637"

Faker::Markdown.emphasis #=> "Quo qui aperiam. Amet corrupti distinctio. Sit quia *dolor.*"

Faker::TvShows::RuPaul.queen #=> "Violet Chachki"

Faker::Alphanumeric.alpha(number: 10) #=> "zlvubkrwga"

Faker::ProgrammingLanguage.name #=> "Ruby"

For a complete list of the generators, see Generators.

A note about the Generators versions

If you get a uninitialized constant Faker::[some_class] error, your version of the gem is behind main.

To make sure that your gem is the one documented here, change the line in your Gemfile to:

gem 'faker', :git => 'https://github.com/faker-ruby/faker.git', :branch => 'main'

The generators have the @faker.version tag on top of their implementation. From the tags, you can identify the version the generator was added:

# Faker::TvShows::ParksAndRec.character

# @faker.version 1.9.0
def character
  fetch('parks_and_rec.characters')
end

Ensuring unique values

To ensure Faker generates unique values, prefix your method call with unique:

Faker::Name.unique.name # This will return a unique name every time it is called

If too many unique values are requested from a generator that has a limited number of potential values, a Faker::UniqueGenerator::RetryLimitExceeded exception may be raised. It is possible to clear the record of unique values that have been returned, for example between tests.

Faker::Name.unique.clear # Clears used values for Faker::Name
Faker::UniqueGenerator.clear # Clears used values for all generators

You also can give some already used values to the unique generator if you have collisions with the generated data (i.e: using FactoryBot with random and manually set values).

# Usage:
# Faker::<generator>.unique.exclude(method, arguments, list)

# Add 'azerty' and 'wxcvbn' to the string generator with 6 char length
Faker::Lorem.unique.exclude :string, [number: 6], %w[azerty wxcvbn]

Deterministic Random

Faker supports seeding of its pseudo-random number generator (PRNG) to provide deterministic output of repeated method calls.

Faker::Config.random = Random.new(42)
Faker::Company.bs #=> "seize collaborative mindshare"
Faker::Company.bs #=> "engage strategic platforms"
Faker::Config.random = Random.new(42)
Faker::Company.bs #=> "seize collaborative mindshare"
Faker::Company.bs #=> "engage strategic platforms"

Faker::Config.random = nil # seeds the PRNG using default entropy sources
Faker::Config.random.seed #=> 185180369676275068918401850258677722187
Faker::Company.bs #=> "cultivate viral synergies"

Customization

You may want Faker to print information depending on your location in the world. To assist you in this, Faker uses the I18n gem to store strings and formats to represent the names and postal codes of the area of your choosing.

Just set the locale you want as shown below, and Faker will take care of the rest.

Faker::Config.locale = 'es'
# or
Faker::Config.locale = :es

To override Faker's locales, and set it on threaded server environments check out the locales README.

Minitest and Faker >= 2.22

To prevent Faker (version >= 2.22) from generating duplicate values when using Minitest, you might need to add the following to the test_helper.rb or rails_helper.rb file:

  Faker::Config.random = Random.new

See Issue #2534 for more details.

Generators

This is the full list of generators available with this gem. If you need details about any of them, make sure to consult the documentation.

NOTE: Some of the generators below aren't released yet. If you want to use them, change the line in your gemfile to:

gem 'faker', :git => 'https://github.com/faker-ruby/faker.git', :branch => 'main'

Default

Faker::DrivingLicence

Faker::Drone

Faker::Educator

Faker::ElectricalComponents

Faker::GreekPhilosophers

Faker::IndustrySegments

Faker::NatoPhoneticAlphabet

Faker::NationalHealthService

Faker::ProgrammingLanguage

Faker::VulnerabilityIdentifier

Faker::WorldCup

Blockchain

Faker::Blockchain::Aeternity

Faker::Blockchain::Bitcoin

Faker::Blockchain::Ethereum

Faker::Blockchain::Tezos

Books

Faker::Book

Faker::Books::CultureSeries

Faker::Books::Dune

Faker::Books::Lovecraft

Faker::Books::TheKingkillerChronicle

Fantasy

Faker::Fantasy::Tolkien

Travel

Faker:Travel::Airport

Faker:Travel::TrainStation

Creature

Faker::Creature::Animal

Faker::Creature::Bird

Faker::Creature::Cat

Faker::Creature::Dog

Faker::Creature::Horse

Games

Faker::Game

Faker::Games::ClashOfClans

Faker::Games::DnD

Faker::Games::Dota

Faker::Games::ElderScrolls

Faker::Games::Fallout

Faker::Games::FinalFantasyXIV

Faker::Games::HalfLife

Faker::Games::Heroes

Faker::Games::HeroesOfTheStorm

Faker::Games::LeagueOfLegends

Faker::Games::Minecraft

Faker::Games::Myst

Faker::Games::Overwatch

Faker::Games::Pokemon

Faker::Games::SonicTheHedgehog

Faker::Games::StreetFighter

Faker::Games::SuperMario

Faker::Games::SuperSmashBros

Faker::Games::Touhou

Faker::Games::WarhammerFantasy

Faker::Games::Witcher

Faker::Games::WorldOfWarcraft

Faker::Games::Zelda

Japanese Media

Faker::JapaneseMedia::CowboyBebop

Faker::JapaneseMedia::DragonBall

Faker::JapaneseMedia::OnePiece

Faker::JapaneseMedia::StudioGhibli

Faker::JapaneseMedia::SwordArtOnline

Faker::JapaneseMedia::Naruto

Faker::JapaneseMedia::Doraemon

Faker::JapaneseMedia::Conan

Faker::JapaneseMedia::FullmetalAlchemistBrotherhood

Movies

Faker::Movie

Faker::Movies::Avatar

Faker::Movies::BackToTheFuture

Faker::Movies::Departed

Faker::Movies::Ghostbusters

Faker::Movies::HarryPotter

Faker::Movies::HitchhikersGuideToTheGalaxy

Faker::Movies::Hobbit

Faker::Movies::HowToTrainYourDragon

Faker::Movies::Lebowski

Faker::Movies::LordOfTheRings

Faker::Movies::PrincessBride

Faker::Movies::StarWars

Faker::Movies::TRON

Faker::Movies::VForVendetta

Music

Faker::Music

Faker::Music::GratefulDead

Faker::Music::Hiphop

Faker::Music::Opera

Faker::Music::PearlJam

Faker::Music::Phish

Faker::Music::Prince

Faker::Music::RockBand

Faker::Music::Rush

Faker::Music::SmashingPumpkins

Faker::Music::UmphreysMcgee

Quotes

Faker::Quote

Faker::Quotes::Chiquito

Faker::Quotes::Rajnikanth

Faker::Quotes::Shakespeare

Sports

Faker::Sport

Faker::Sports::Basketball

Faker::Sports::Chess

Faker::Sports::Football

Faker::Sports::Mountaineering

Faker::Sports::Volleyball

Tv Shows

Faker::TvShows::AquaTeenHungerForce

Faker::TvShows::Archer

Faker::TvShows::BigBangTheory

Faker::TvShows::BojackHorseman

Faker::TvShows::BreakingBad

Faker::TvShows::BrooklynNineNine

Faker::TvShows::Buffy

Faker::TvShows::Community

Faker::TvShows::DrWho

Faker::TvShows::DumbAndDumber

Faker::TvShows::FamilyGuy

Faker::TvShows::FinalSpace

Faker::TvShows::Friends

Faker::TvShows::GameOfThrones

Faker::TvShows::HeyArnold

Faker::TvShows::HowIMetYourMother

Faker::TvShows::MichaelScott

Faker::TvShows::NewGirl

Faker::TvShows::ParksAndRec

Faker::TvShows::RickAndMorty

Faker::TvShows::RuPaul

Faker::TvShows::Seinfeld

Faker::TvShows::SiliconValley

Faker::TvShows::Simpsons

Faker::TvShows::SouthPark

Faker::TvShows::Spongebob

Faker::TvShows::StarTrek

Faker::TvShows::Stargate

Faker::TvShows::StrangerThings

Faker::TvShows::Suits

Faker::TvShows::Supernatural

Faker::TvShows::TheExpanse

Faker::TvShows::TheFreshPrinceOfBelAir

Faker::TvShows::TheITCrowd

Faker::TvShows::TheThickOfIt

Faker::TvShows::TwinPeaks

Faker::TvShows::VentureBros

Locations

Faker::Locations::Australia

Contributing

Note: We are not accepting proposals for new generators and locales. The Contributing guide has a few notes about this decision.

Take a look at the Contributing document for instructions on setting up the repo on your machine, opening bug reports, understanding the codebase, and creating a good pull request.

There is a Discord channel to discuss anything regarding improvements or feature requests.

Thank you, contributors!

Versioning

Faker follows Semantic Versioning 2.0 as defined at https://semver.org.

License

This code is free to use under the terms of the MIT license.

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Completed work

Posted Mar 23, 2025

A library for generating fake data such as names, addresses, and phone numbers. - faker-ruby/faker

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