Fix bug where unserializing an attribute attempts to modify a frozen @attributes hash for a deleted record. [Rick]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7406 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Fix bug where unserializing an attribute attempts to modify a frozen @attributes hash for a deleted record.  [Rick]
+
 * Performance: absorb instantiate and initialize_with_callbacks into the Base methods. [Jeremy Kemper]
 
 * Fixed that eager loading queries and with_scope should respect the :group option [DHH]

activerecord/lib/active_record/attribute_methods.rb

@@ -207,7 +207,7 @@ module ActiveRecord
       unserialized_object = object_from_yaml(@attributes[attr_name])
 
       if unserialized_object.is_a?(self.class.serialized_attributes[attr_name]) || unserialized_object.nil?
-        @attributes[attr_name] = unserialized_object
+        @attributes.frozen? ? unserialized_object : @attributes[attr_name] = unserialized_object
       else
         raise SerializationTypeMismatch,
           "#{attr_name} was supposed to be a #{self.class.serialized_attributes[attr_name]}, but was a #{unserialized_object.class.to_s}"

activerecord/test/attribute_methods_test.rb

@@ -1,4 +1,5 @@
 require 'abstract_unit'
+require 'fixtures/topic'
 
 class AttributeMethodsTest < Test::Unit::TestCase
   def setup
@@ -46,4 +47,12 @@ class AttributeMethodsTest < Test::Unit::TestCase
       assert_equal ['title', 1, 2, 3], topic.send(meth, 1, 2, 3)
     end
   end
+  
+  def test_should_unserialize_attributes_for_frozen_records
+    myobj = {:value1 => :value2}
+    topic = Topic.create("content" => myobj)
+    topic.freeze
+    assert_equal myobj, topic.content
+    
+  end
 end