Can't pass method symbol name to if

[mhmaguire]

Condition on an event doesn't take method name symbol as indicated in the documentation

class Thing < ActiveRecord::Base
    include Workflow 

    workflow do 
        state :on do 
            event :turn_off, transitions_to: :off
        end

        state :off do 
            event :turn_on, transitions_to: :on, if: :has_power
        end
    end

    def has_power
        power > 0
    end

    def turn_on
        halt!('cannot turn on') unless check
    end
end

Thing.new # => TypeError: condition must be nil or callable (eg. a proc or lambda)

with 1.2.0

[mhmaguire]

hmmm i see that source for 1.2.0 doesn't support symbol method names so perhaps this is a non issue

[dan-jensen]

Yeah, the documentation still needs to be corrected. The conditional event transitions should only show the proc example.

For anyone who wants to use the same proc in multiple places (like an instance method), you can store the proc to a constant like this:

TRANSITIONS_TO_ANOTHER_STATE = proc do |record|
  record.should_transition?
end

workflow do
  state :default do
    event :something_happened, transitions_to: :another_state, if: TRANSITIONS_TO_ANOTHER_STATE
  end
end