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How To Populate Your Database with Fake Data: Ruby On Ruby On Rails Tutorial. The Faker gem allows you to create fake data to populate your database. Populator can generate names, emails, credit card numbers, addresses, you name it. Faker randomly returns a new user every time it is called. It's amazing to see all potential uses of Faker in this tutorial. You'll need two gems: Populator, Faker and Populator. If you only use Populator you'll have to hardcode the content provided - not cool.