making query cache work with prepared statements

activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb

@@ -49,23 +49,24 @@ def clear_query_cache
         @query_cache.clear
       end
 
-      def select_all(*args)
+      def select_all(sql, name = nil, binds = [])
         if @query_cache_enabled
-          cache_sql(args.first) { super }
+          cache_sql(sql, binds) { super }
         else
           super
         end
       end
 
       private
-        def cache_sql(sql)
+        def cache_sql(sql, binds)
+          key = [sql, binds]
           result =
-            if @query_cache.has_key?(sql)
+            if @query_cache.has_key?(key)
               ActiveSupport::Notifications.instrument("sql.active_record",
                 :sql => sql, :name => "CACHE", :connection_id => self.object_id)
-              @query_cache[sql]
+              @query_cache[key]
             else
-              @query_cache[sql] = yield
+              @query_cache[key] = yield
             end
 
           if Array === result

activerecord/test/cases/query_cache_test.rb

@@ -22,6 +22,12 @@ def test_find_queries_with_cache
     end
   end
 
+  def test_find_queries_with_cache
+    Task.cache do
+      assert_queries(2) { Task.find(1); Task.find(1); Task.find(2) }
+    end
+  end
+
   def test_count_queries_with_cache
     Task.cache do
       assert_queries(1) { Task.count; Task.count }