Assume subscribers have an identifier

lib/assets/javascripts/cable.js.coffee

@@ -13,8 +13,5 @@ class @Cable
     params = if typeof channel is "object" then channel else {channel}
     new Cable.Channel this, params, mixin
 
-  sendMessage: (identifier, data) ->
-    @sendCommand(identifier, "message", data)
-
-  sendCommand: (identifier, command, data) ->
-    @connection.send({identifier, command, data})
+  send: (data) ->
+    @connection.send(data)

lib/assets/javascripts/cable/channel.js.coffee

@@ -2,7 +2,7 @@ class Cable.Channel
   constructor: (@cable, params = {}, mixin) ->
     @identifier = JSON.stringify(params)
     extend(this, mixin)
-    @cable.subscribers.add(@identifier, this)
+    @cable.subscribers.add(this)
 
   # Perform a channel action with the optional data passed as an attribute
   perform: (action, data = {}) ->
@@ -10,10 +10,10 @@ class Cable.Channel
     @send(data)
 
   send: (data) ->
-    @cable.sendMessage(@identifier, JSON.stringify(data))
+    @cable.send(command: "message", identifier: @identifier, data: JSON.stringify(data))
 
   unsubscribe: ->
-    @cable.subscribers.remove(@identifier)
+    @cable.subscribers.remove(this)
 
   extend = (object, properties) ->
     if properties?

lib/assets/javascripts/cable/subscriber_manager.js.coffee

@@ -2,25 +2,32 @@ class Cable.SubscriberManager
   constructor: (@cable) ->
     @subscribers = {}
 
-  add: (identifier, subscriber) ->
+  add: (subscriber) ->
+    {identifier} = subscriber
     @subscribers[identifier] = subscriber
-    if @cable.sendCommand(identifier, "subscribe")
-      @notify(identifier, "connected")
+    if @sendCommand("subscribe", identifier)
+      @notify(subscriber, "connected")
 
   reload: ->
-    for identifier in Object.keys(@subscribers)
-      if @cable.sendCommand(identifier, "subscribe")
-        @notify(identifier, "connected")
+    for identifier, subscriber of @subscribers
+      if @sendCommand("subscribe", identifier)
+        @notify(subscriber, "connected")
 
-  remove: (identifier) ->
-    if subscriber = @subscribers[identifier]
-      @cable.sendCommand(identifier, "unsubscribe")
+  remove: (subscriber) ->
+    {identifier} = subscriber
+    @sendCommand("unsubscribe", identifier)
     delete @subscribers[identifier]
 
   notifyAll: (event, args...) ->
-    for identifier in Object.keys(@subscribers)
-      @notify(identifier, event, args...)
+    for identifier, subscriber of @subscribers
+      @notify(subscriber, event, args...)
 
-  notify: (identifier, event, args...) ->
-    if subscriber = @subscribers[identifier]
+  notify: (subscriber, event, args...) ->
+    if typeof subscriber is "string"
+      subscriber = @subscribers[subscriber]
+
+    if subscriber
       subscriber[event]?(args...)
+
+  sendCommand: (command, identifier) ->
+    @cable.send({command, identifier})