fix issue initial state doesn't work in active_record 4.2

[fly1tkg]

This PR is for #334 .

[seuros]

The initial state won't persist to the database.

[destino92]

Hello guys how do i apply this fix to the state-machine gem

[shushugah]

Hey Destino92, if you you want to monkey patch it, you can create a file

config/initializers/state_machine.rb

with

# Hacks around https://github.com/pluginaweek/state_machine/issues/334
module StateMachine
  module Integrations
    module ActiveRecord
      def define_state_initializer
        define_helper :instance, <<-end_eval, __FILE__, __LINE__ + 1
          def initialize(*)
            super do |*args|
              self.class.state_machines.initialize_states self
              yield(*args) if block_given?
            end
          end
        end_eval
      end
    end
  end
end