Merge pull request #24820 from maclover7/fix-15843

Ensure compatibility between ActionDispatch::Request::Session and Rack

actionpack/lib/action_dispatch/request/session.rb

@@ -198,6 +198,10 @@ def merge!(other)
         @delegate.merge!(other)
       end
 
+      def each(&block)
+        to_hash.each(&block)
+      end
+
       private
 
       def load_for_read!

actionpack/test/dispatch/request/session_test.rb

@@ -114,5 +114,31 @@ def delete_session(env, id, options); 123; end
         }.new
       end
     end
+
+    class SessionIntegrationTest < ActionDispatch::IntegrationTest
+      class MySessionApp
+        def call(env)
+          request = Rack::Request.new(env)
+          request.session['hello'] = 'Hello from MySessionApp!'
+          [ 200, {}, ['Hello from MySessionApp!'] ]
+        end
+      end
+
+      Router = ActionDispatch::Routing::RouteSet.new
+      Router.draw do
+        get '/mysessionapp' => MySessionApp.new
+      end
+
+      def app
+        @app ||= RoutedRackApp.new(Router)
+      end
+
+      def test_session_follows_rack_api_contract_1
+        get '/mysessionapp'
+        assert_response :ok
+        assert_equal 'Hello from MySessionApp!', @response.body
+        assert_equal 'Hello from MySessionApp!', session['hello']
+      end
+    end
   end
 end