Modified version of Avdi Grimm's solution for configuring RSpec and Capybara to use DatabaseCleaner

database_cleaner.rb

RSpec.configure do |config|
  config.before(:suite) do
    DatabaseCleaner.clean_with(:truncation)
  end

  config.before(:each) do
    DatabaseCleaner.strategy = Capybara.current_driver == :rack_test ? :transaction : :truncation
    DatabaseCleaner.start
  end

  config.after(:each) do
    DatabaseCleaner.clean
  end
end