title: Turn off transactional fixtures for one spec with RSpec 2
body: <p>How do I turn off transactional fixtures for only one spec (or Steak scenario) with RSpec 2?
  I tried some things found on the web without any success.</p>
  
  <p>This leads to an undefined method exception.</p>
  
  <pre>
  describe "MyClass without transactional fixtures" do
    self.use_transactional_fixtures = false
    ...
  end
  </pre>
  
  <p>This simply does nothing (transactional fixture is still on):</p>
  
  <pre>
  describe "MyClass without transactional fixtures" do
    RSpec.configure do |config|
      config.use_transactional_fixtures = false
    end
    ...
  end
  </pre>
  
  <p>What else could I try?</p>