From 74d764b120fad7fd21781b3c2df4abfac5518e78 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Tue, 7 Jul 2015 21:39:16 +0200
Subject: Allow actions not to accept the data argument

---
 lib/action_cable/channel/base.rb | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/action_cable/channel/base.rb b/lib/action_cable/channel/base.rb
index f5d7011a72..fb29ba1893 100644
--- a/lib/action_cable/channel/base.rb
+++ b/lib/action_cable/channel/base.rb
@@ -52,8 +52,7 @@ module ActionCable
         action = extract_action(data)
 
         if processable_action?(action)
-          logger.info action_signature(action, data)
-          public_send action, data
+          dispatch_action(action, data)
         else
           logger.error "Unable to process #{action_signature(action, data)}"
         end
@@ -102,6 +101,16 @@ module ActionCable
           self.class.instance_methods(false).include?(action)
         end
 
+        def dispatch_action(action, data)
+          logger.info action_signature(action, data)
+          
+          if method(action).arity == 1
+            public_send action, data
+          else
+            public_send action
+          end
+        end
+
         def action_signature(action, data)
           "#{self.class.name}##{action}".tap do |signature|
             if (arguments = data.except('action')).any?
-- 
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