Ensure QueryCache doesn't try to dup numeric results (does not affect the major OS database). Closes #7661 [tomafro, nzkoz]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7399 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/query_cache.rb

@@ -59,12 +59,13 @@ module ActiveRecord
           @query_cache[sql] = yield
         end
 
-        if result
-          # perform a deep #dup in case result is an array
-          result = result.collect { |row| row.dup } if result.is_a?(Array)
-          result.dup
+        case result
+        when Array
+          result.collect { |row| row.dup }
+        when Numeric, NilClass, FalseClass
+          result
         else
-          nil
+          result.dup
         end
       end
     

activerecord/test/query_cache_test.rb

@@ -16,7 +16,13 @@ class QueryCacheTest < Test::Unit::TestCase
       assert_queries(1) {  Task.find(1); Task.find(1) }
     end
   end
-  
+
+  def test_count_queries_with_cache
+    Task.cache do
+      assert_queries(1) {  Task.count; Task.count }
+    end
+  end
+
   def test_query_cache_returned
     assert_not_equal ActiveRecord::QueryCache, Task.connection.class
     Task.cache do