Setup base channel authentication for action cable

app/channels/application_cable/connection.rb

@@ -1,4 +1,19 @@
 module ApplicationCable
   class Connection < ActionCable::Connection::Base
+    identified_by :current_user
+
+    def connect
+      self.current_user = find_verified_user
+    end
+
+    private
+
+    def find_verified_user
+      if verified_user = User.find_by(id: cookies.signed['user.id'])
+        verified_user
+      else
+        reject_unauthorized_connection
+      end
+    end
   end
 end