treat plain Ruby reading and writing as kind of persistence (refactoring)

lib/aasm/aasm.rb

@@ -40,24 +40,6 @@ module AASM
     @aasm ||= AASM::InstanceBase.new(self)
   end
 
-  # may be overwritten by persistence mixins
-  def aasm_read_state
-    # all the following lines behave like @current_state ||= aasm.enter_initial_state
-    current = aasm.instance_variable_get("@current_state")
-    return current if current
-    aasm.instance_variable_set("@current_state", aasm.enter_initial_state)
-  end
-
-  # may be overwritten by persistence mixins
-  def aasm_write_state(new_state)
-    true
-  end
-
-  # may be overwritten by persistence mixins
-  def aasm_write_state_without_persistence(new_state)
-    true
-  end
-
 private
 
   # Takes args and a from state and removes the first

lib/aasm/persistence.rb

@@ -15,6 +15,9 @@ module AASM
         elsif hierarchy.include?("Sequel::Model")
           require_files_for(:sequel)
           base.send(:include, AASM::Persistence::SequelPersistence)
+        else
+          require File.join(File.dirname(__FILE__), 'persistence', 'plain_persistence')
+          base.send(:include, AASM::Persistence::PlainPersistence)
         end
       end
 

lib/aasm/persistence/plain_persistence.rb

@@ -0,0 +1,24 @@
+module AASM
+  module Persistence
+    module PlainPersistence
+
+      def aasm_read_state
+        # all the following lines behave like @current_state ||= aasm.enter_initial_state
+        current = aasm.instance_variable_get("@current_state")
+        return current if current
+        aasm.instance_variable_set("@current_state", aasm.enter_initial_state)
+      end
+
+      # may be overwritten by persistence mixins
+      def aasm_write_state(new_state)
+        true
+      end
+
+      # may be overwritten by persistence mixins
+      def aasm_write_state_without_persistence(new_state)
+        true
+      end
+
+    end
+  end
+end