Remove explicit session use, add monkeypatch for Rails bug, sidekiq#2460

myapp/config/application.rb

@@ -55,5 +55,6 @@ class Application < Rails::Application
 
     # Version of your assets, change this if you want to expire all your assets
     config.assets.version = '1.0'
+    config.secret_key_base = "sidekiq"
   end
 end

myapp/config/initializers/session_store.rb

@@ -6,3 +6,18 @@
 # which shouldn't be used to store highly confidential information
 # (create the session table with "rails generate session_migration")
 # Myapp::Application.config.session_store :active_record_store
+
+
+# Monkeypatch necessary due to https://github.com/rails/rails/issues/15843
+require 'rack/session/abstract/id'
+class Rack::Session::Abstract::SessionHash
+  private
+  def stringify_keys(other)
+    hash = {}
+    other = other.to_hash unless other.is_a?(Hash) # hack hack hack
+    other.each do |key, value|
+      hash[key.to_s] = value
+    end
+    hash
+  end
+end

myapp/simple.ru

@@ -5,9 +5,8 @@ require 'sidekiq'
 
 # A Web process always runs as client, no need to configure server
 Sidekiq.configure_client do |config|
-  config.redis = { url: 'redis://localhost:6379/0', size: 1 }
+  config.redis = { url: 'redis://localhost:6379/0', size: 1, namespace: 'foo' }
 end
 
 require 'sidekiq/web'
-use Rack::Session::Cookie, :secret => "some unique secret string here"
 run Sidekiq::Web