Just look for state-machine (finite state automata) on github https://github.com/search?q=state-machine&type=repositories https://github.com/search?q=state-mac

Just look for state-machine (finite state automata) on github https://github.com/search?q=state-machine&type=repositories https://github.com/search?q=state-machine&type=repositories This is a very common pattern in Ruby to manage state. It's especially useful to guard entering impossible states with respect to business logic and figuring out what went wrong. Something along the lines of: Can't transition Command from 'ordered' to 'to-deliver': paid() == false look at this gem https://github.com/pluginaweek/state_machine https://github.com/pluginaweek/state_machine to get an idea of what features are possible