Revert "Only save the session if we're actually writing to it [#2703 state:resolved]"

This reverts commit dd98280e.

actionpack/lib/action_dispatch/middleware/session/abstract_store.rb

@@ -15,7 +15,6 @@ def initialize(by, env)
           @by = by
           @env = env
           @loaded = false
-          @updated = false
         end
 
         def session_id
@@ -33,7 +32,6 @@ def [](key)
         def []=(key, value)
           load! unless @loaded
           super(key.to_s, value)
-          @updated = true
         end
 
         def to_hash
@@ -81,10 +79,6 @@ def loaded?
             @loaded
           end
 
-          def updated?
-            @updated
-          end
-
           def load!
             stale_session_check! do
               id, session = @by.send(:load_session, @env)
@@ -153,10 +147,7 @@ def call(env)
         options = env[ENV_SESSION_OPTIONS_KEY]
 
         if !session_data.is_a?(AbstractStore::SessionHash) || session_data.send(:loaded?) || options[:expire_after]
-          if session_data.is_a?(AbstractStore::SessionHash)
-            session_data.send(:load!) if !session_data.send(:loaded?)
-            return response if !session_data.send(:updated?)
-          end
+          session_data.send(:load!) if session_data.is_a?(AbstractStore::SessionHash) && !session_data.send(:loaded?)
 
           sid = options[:id] || generate_sid
 

actionpack/test/activerecord/active_record_store_test.rb

@@ -22,11 +22,6 @@ def get_session_value
       render :text => "foo: #{session[:foo].inspect}"
     end
 
-    def set_cookie_and_get_session_value
-      cookies["kittens"] = { :value => "fluffy" }
-      render :text => "foo: #{session[:foo].inspect}"
-    end
-
     def get_session_id
       session[:foo]
       render :text => "#{request.session_options[:id]}"
@@ -83,23 +78,6 @@ def test_getting_nil_session_value
     end
   end
 
-  def test_getting_session_value_does_not_set_cookie
-    with_test_route_set do
-      get '/get_session_value'
-      assert_response :success
-      assert_equal "", headers["Set-Cookie"]
-    end
-  end
-
-  def test_getting_session_value_and_setting_a_cookie_doesnt_delete_all_cookies
-    with_test_route_set do
-      get '/set_cookie_and_get_session_value'
-      assert_response :success
-      assert_equal 'foo: nil', response.body
-      assert_equal({"kittens" => "fluffy"}, response.cookies)
-    end
-  end
-
   def test_setting_session_value_after_session_reset
     with_test_route_set do
       get '/set_session_value'

actionpack/test/dispatch/session/mem_cache_store_test.rb

@@ -61,14 +61,6 @@ def test_getting_nil_session_value
       end
     end
 
-    def test_getting_session_value_does_not_set_cookie
-      with_test_route_set do
-        get '/get_session_value'
-        assert_response :success
-        assert_equal "", headers["Set-Cookie"]
-      end
-    end
-
     def test_setting_session_value_after_session_reset
       with_test_route_set do
         get '/set_session_value'