module AASM::Persistence::PlainPersistence

def aasm_read_state(name=:default)
  # all the following lines behave like @current_state ||= aasm(name).enter_initial_state
  current = aasm(name).instance_variable_defined?("@current_state_#{name}") &&
            aasm(name).instance_variable_get("@current_state_#{name}")
  return current if current
  aasm(name).instance_variable_set("@current_state_#{name}", aasm(name).enter_initial_state)
end