THOUGHTS

by adding new abstraction layers
* automatical think about interfaces
* testability
* more optional features, e.g. by using a representer you get HAL etc for free once included. how would that work with rabl? or easy nested forms with reform

the less associations in models the better

hi-level APIs: Invoice::Flow instead of creating I:Item out-of-sync
  if your factories have 5 lines or more, your API is wrong, (Invoice::Flow)


i don't wanna show anti-patterns, i wanna show how you can make things work.