Two state machines in Single ruby class

Question

Following are System Specifications :=

• Language Ruby
• Framework Padrino
• ORM Mongoid
• Database MongoDB

Now I have a Person model with two fields tat maintain states separately.

class Person
    include Mongoid::Document
    include Mongoid::Timestamps
    # Field Names
    #-----------------
    field :name, :type => String 
    field :sms_state, :type => String, :default => 'main_menu'
    field :ivr_state, :type => String, :default => 'main_menu'
end

I add State Machines using Monkey Patching, as I need to Update the State as per request controller. ie, If SMS Controller is requested then only SMS State Machine for sms_state should Monkey Patched and similarly for IVR Controller I do Monkey Patching this way, (Reason for Monkey PAtching as the entire flow and states of State Machine are same except the State Field, and Events Change...)

Person.class_eval do
    state_machine :state_field, :initial => :main_menu do
        # State Machine Flow
        # Events Details
        #===============================================================
        event :state_reset do
            transition all - [:country_confirmation, :topup_confirmation] => :main_menu
        end

        event :country_list do
            transition [:main_menu, :did_purchased, :country_probed] => :country_listed
        end

        # States Details
        #===============================================================================
        state :main_menu do
            define_method (:get_msg) {|obj| current_module.get_main_menu_msg(obj.dids.count, obj.spokn_id) }
        end

        state :country_listed do 
            define_method (:get_msg) {|obj| current_module.get_country_list_msg Country.all }
        end
    end
end

But It Works Fine for State Machine only. Suppose it was working Fine for SMS Controller, and If request comes from IVR Controller the Ivr State Machine is Monkey Patched. But State Field Doesn't and I get following ERROR

StateMachine::InvalidTransition - Cannot transition sms_state via :ivr_country_list from :country_listed