3 files changed, 6 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index 1798afc3b7..00023b0b6c 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -58,12 +58,13 @@ module ActiveRecord
           self.serialized_attributes = serialized_attributes.merge(attr_name.to_s => coder)
         end
 
-        def initialize_attributes(attributes) #:nodoc:
-          super
+        def initialize_attributes(attributes, options = {}) #:nodoc:
+          serialized = (options.delete(:serialized) { true }) ? :serialized : :unserialized
+          super(attributes, options)
 
           serialized_attributes.each do |key, coder|
             if attributes.key?(key)
-              attributes[key] = Attribute.new(coder, attributes[key], :serialized)
+              attributes[key] = Attribute.new(coder, attributes[key], serialized)
             end
           end
 
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 8c8717b759..2ac259d52d 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -533,7 +533,7 @@ module ActiveRecord #:nodoc:
       # The dup method does not preserve the timestamps (created|updated)_(at|on).
       def initialize_dup(other)
         cloned_attributes = other.clone_attributes(:read_attribute_before_type_cast)
-        self.class.initialize_attributes(cloned_attributes)
+        self.class.initialize_attributes(cloned_attributes, :serialized => false)
 
         cloned_attributes.delete(self.class.primary_key)
 
diff --git a/activerecord/lib/active_record/locking/optimistic.rb b/activerecord/lib/active_record/locking/optimistic.rb
index 0e33cdb617..7deac2588a 100644
--- a/activerecord/lib/active_record/locking/optimistic.rb
+++ b/activerecord/lib/active_record/locking/optimistic.rb
@@ -170,7 +170,7 @@ module ActiveRecord
         # start the lock version at zero. Note we can't use
         # <tt>locking_enabled?</tt> at this point as
         # <tt>@attributes</tt> may not have been initialized yet.
-        def initialize_attributes(attributes) #:nodoc:
+        def initialize_attributes(attributes, options = {}) #:nodoc:
           if attributes.key?(locking_column) && lock_optimistically
             attributes[locking_column] ||= 0
           end