fix(rails): make Action Cable handle_open/handle_close overrides public for Rails 8.2

CHANGELOG.md

@@ -1,3 +1,9 @@
+## Unreleased
+
+### Bug Fixes 🐛
+
+- (rails) Make Action Cable `handle_open`/`handle_close` overrides public so Rails 8.2's `ActionCable::Server::Socket` can invoke them ([rails/rails#50979](https://github.com/rails/rails/pull/50979)); the private overrides raised `NoMethodError` on every cable connection, killing all websocket traffic
+
 ## 6.6.2
 
 ### Bug Fixes 🐛

sentry-rails/lib/sentry/rails/action_cable.rb

@@ -57,8 +57,13 @@ def finish_transaction(transaction, status_code)
       end
 
       module Connection
-        private
-
+        # These overrides must stay public: Rails 8.2 decoupled the Action
+        # Cable connection from the socket (rails/rails#50979), and
+        # ActionCable::Server::Socket now invokes connection.handle_open and
+        # connection.handle_close from outside the connection. With private
+        # overrides every cable connection raises NoMethodError before the
+        # welcome message is sent. On older Rails versions these methods are
+        # only called internally, so public visibility is harmless there.
         def handle_open
           ErrorHandler.capture(self, transaction_name: "#{self.class.name}#connect") do
             super

sentry-rails/spec/sentry/rails/action_cable_spec.rb

@@ -73,6 +73,20 @@ def disconnect
       transport.events = []
     end
 
+    describe "Connection method visibility" do
+      before do
+        make_basic_app
+      end
+
+      # Rails 8.2 (rails/rails#50979) invokes connection.handle_open and
+      # connection.handle_close from ActionCable::Server::Socket, outside the
+      # connection — private overrides break every cable connection there.
+      it "keeps handle_open and handle_close public" do
+        expect(Sentry::Rails::ActionCableExtensions::Connection.public_method_defined?(:handle_open)).to eq(true)
+        expect(Sentry::Rails::ActionCableExtensions::Connection.public_method_defined?(:handle_close)).to eq(true)
+      end
+    end
+
     describe "Connection" do
       before do
         make_basic_app