Question

In a Rails 3 app I have the following:

class Kase < ActiveRecord::Base
  state_machine :state, :initial => :lead do
    state :lead
    state :active
    state :completed

    event :reset_status do
      transition any => :lead
    end

    event :activate do
      transition any => :active
    end

    event :complete do
      transition any => :completed
    end
  end
end

The documentation (https://github.com/pluginaweek/state_machine) shows that the following should be available for my situation:

vehicle.state_paths # => [[#<StateMachine::Transition ...], [#<StateMachine::Transition ...], ...]
vehicle.state_paths.to_states # => [:lead, :active, :completed]

However, when I run the following I get an error:

@kase = Kase.first
@kase.state
  => "lead"
@kase.state_paths
  NoMethodError: undefined method `state_paths' for #<Kase:0x00000100d95ca0> ...

I’m trying to get a list of all the possible states for a Kase. What am I missing?

Answer 1

state_paths is not available in a released version of state_machine yet. A new version will be released this week that includes the feature you’re trying to use.