gistfile1.txt

    config.before :suite do
      DatabaseCleaner.strategy = :transaction
      DatabaseCleaner.clean_with(:truncation)
    end

    # Request specs cannot use a transaction because Capybara runs in a
    # separate thread with a different database connection.
    config.before type: :request do
      DatabaseCleaner.strategy = :truncation
    end

    config.before do
      DatabaseCleaner.start
    end

    config.after do
      DatabaseCleaner.clean
    end


via http://highgroove.com/articles/2012/04/06/sane-rspec-config-for-clean,-and-slightly-faster,-specs.html