transaction.rb

Around do |scenario, block|
  # We can't use .begin/rollback_db_transaction as they don't do the
  # savepoint emulation on MySQL, it's all encapsulated in
  # .transaction
  result = nil
  ActiveRecord::Base.transaction(:requires_new => true) do
    begin
      result = block.call
    ensure
      raise ActiveRecord::Rollback
    end
  end
  result
end