Overwrite method to read the current state. Used to provide another storage mechanism,
different from the standard Rails read_attribute method.

  class MyClass
    include AASM

    def aasm_read_state
      # retrieve the current state manually
    end
  end


Overwrite method to write the current state (and actually persist it). Used to provide
another storage mechanism, different from the standard Rails write_attribute method.

  class MyClass
    include AASM

    def aasm_write_state
      # store and persist the current state manually
    end
  end


Overwrite method to write the current state (without persisting it).

  class MyClass
    include AASM

    def aasm_write_state_without_persistence
      # store the current state manually
    end
  end