diff --git a/activerecord/lib/active_record/query_cache.rb b/activerecord/lib/active_record/query_cache.rb
index 415b25e09684b3ab888e18315bcd99a0cda7ecf9..e2f5c1bd88d6ac5270dacc18e15f0f4b2a9f97a6 100644
--- a/activerecord/lib/active_record/query_cache.rb
+++ b/activerecord/lib/active_record/query_cache.rb
@@ -63,16 +63,28 @@ class << self
       def query_caches
         (Thread.current[:query_cache] ||= {})
       end
+      
+      def query_cache
+        if query_caches[self]
+          query_caches[self]
+        elsif superclass.respond_to?(:query_cache)
+          superclass.query_cache
+        end
+      end
+      
+      def query_cache=(cache)
+        query_caches[self] = cache
+      end
             
       def cache        
-        query_caches[self] = QueryCache.new(connection)
+        self.query_cache = QueryCache.new(connection_without_query_cache)
         yield
       ensure 
-        query_caches[self] = nil
+        self.query_cache = nil
       end        
       
       def connection
-        query_caches[self] || connection_without_query_cache
+        query_cache || connection_without_query_cache
       end
     end
   end  
diff --git a/activerecord/test/query_cache_test.rb b/activerecord/test/query_cache_test.rb
index 532635148350f15bcf9819862552c6760b458d32..1ede03e70ea8dd8a6a4b0a6fb3359bd71307c622 100644
--- a/activerecord/test/query_cache_test.rb
+++ b/activerecord/test/query_cache_test.rb
@@ -3,10 +3,8 @@
 require 'fixtures/reply'
 require 'fixtures/task'
 
-
 class QueryCacheTest < Test::Unit::TestCase
   fixtures :tasks
-
   
   def test_find_queries
     assert_queries(2) {  Task.find(1); Task.find(1) }        
@@ -23,14 +21,32 @@ def test_find_queries_with_cache
       assert_queries(1) {  Task.find(1); Task.find(1) }    
     end
   end
+  
+  def test_query_cache_returned        
+    assert_not_equal ActiveRecord::QueryCache, Task.connection.class
+    Task.cache do 
+      assert_equal ActiveRecord::QueryCache, Task.connection.class      
+    end    
+  end
+  
 
   def test_cache_is_scoped_on_actual_class_only
     Task.cache do
       assert_queries(2) {  Topic.find(1); Topic.find(1) }    
     end
   end
+  
+  
+  def test_cache_is_scoped_on_all_descending_classes
+    ActiveRecord::Base.cache do
+      assert_queries(1) {  Task.find(1); Task.find(1) }    
+    end
+  end
+  
+  
 end
 
+
 uses_mocha('QueryCacheExpiryTest') do
 
 class QueryCacheExpiryTest < Test::Unit::TestCase