Allow AR Session Store to be renewed

actionpack/test/activerecord/active_record_store_test.rb

@@ -27,6 +27,12 @@ class ActiveRecordStoreTest < ActionDispatch::IntegrationTest
       head :ok
     end
 
+    def renew
+      env["rack.session.options"][:renew] = true
+      session[:foo] = "baz"
+      head :ok
+    end
+
     def rescue_action(e) raise end
   end
 
@@ -64,6 +70,20 @@ class ActiveRecordStoreTest < ActionDispatch::IntegrationTest
         end
       end
     end
+
+    define_method("test_renewing_with_#{class_name}_store") do
+      with_store class_name do
+        with_test_route_set do
+          get '/set_session_value'
+          assert_response :success
+          assert cookies['_session_id']
+
+          get '/renew'
+          assert_response :success
+          assert_not_equal [], headers['Set-Cookie']
+        end
+      end
+    end
   end
 
   def test_getting_nil_session_value

activerecord/lib/active_record/session_store.rb

@@ -321,6 +321,7 @@ module ActiveRecord
         if sid = current_session_id(env)
           Base.silence do
             get_session_model(env, sid).destroy
+            env[SESSION_RECORD_KEY] = nil
           end
         end