1 files changed, 29 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable/channel/broadcasting.rb b/actioncable/lib/action_cable/channel/broadcasting.rb
new file mode 100644
index 0000000000..afc23d7d1a
--- /dev/null
+++ b/actioncable/lib/action_cable/channel/broadcasting.rb
@@ -0,0 +1,29 @@
+require 'active_support/core_ext/object/to_param'
+
+module ActionCable
+  module Channel
+    module Broadcasting
+      extend ActiveSupport::Concern
+
+      delegate :broadcasting_for, to: :class
+
+      class_methods do
+        # Broadcast a hash to a unique broadcasting for this <tt>model</tt> in this channel.
+        def broadcast_to(model, message)
+          ActionCable.server.broadcast(broadcasting_for([ channel_name, model ]), message)
+        end
+
+        def broadcasting_for(model) #:nodoc:
+          case
+          when model.is_a?(Array)
+            model.map { |m| broadcasting_for(m) }.join(':')
+          when model.respond_to?(:to_gid_param)
+            model.to_gid_param
+          else
+            model.to_param
+          end
+        end
+      end
+    end
+  end
+end