From b085fa0099d75cf112e07ac580f282fb22afa7b9 Mon Sep 17 00:00:00 2001
From: Jeremy Ashkenas <jashkenas@gmail.com>
Date: Thu, 2 Dec 2010 09:59:26 -0500
Subject: [PATCH] Events#trigger ... making it safe to unbind your own event
 within a trigger() call.

---
 backbone.js    |  6 ++++--
 test/events.js | 14 ++++++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/backbone.js b/backbone.js
index 640fbb83..3031eb10 100644
--- a/backbone.js
+++ b/backbone.js
@@ -92,12 +92,14 @@
     trigger : function(ev) {
       var list, calls, i, l;
       if (!(calls = this._callbacks)) return this;
-      if (list = calls[ev]) {
+      if (calls[ev]) {
+        list = calls[ev].slice(0);
         for (i = 0, l = list.length; i < l; i++) {
           list[i].apply(this, Array.prototype.slice.call(arguments, 1));
         }
       }
-      if (list = calls['all']) {
+      if (calls['all']) {
+        list = calls['all'].slice(0);
         for (i = 0, l = list.length; i < l; i++) {
           list[i].apply(this, arguments);
         }
diff --git a/test/events.js b/test/events.js
index 83808428..cdc8e8df 100644
--- a/test/events.js
+++ b/test/events.js
@@ -39,4 +39,18 @@ $(document).ready(function() {
     equals(obj.counterB, 2, 'counterB should have been incremented twice.');
   });
 
+  test("Events: two binds that unbind themeselves", function() {
+    var obj = { counterA: 0, counterB: 0 };
+    _.extend(obj,Backbone.Events);
+    var incrA = function(){ obj.counterA += 1; obj.unbind('event', incrA); };
+    var incrB = function(){ obj.counterB += 1; obj.unbind('event', incrB); };
+    obj.bind('event', incrA);
+    obj.bind('event', incrB);
+    obj.trigger('event');
+    obj.trigger('event');
+    obj.trigger('event');
+    equals(obj.counterA, 1, 'counterA should have only been incremented once.');
+    equals(obj.counterB, 1, 'counterB should have only been incremented once.');
+  });
+
 });
\ No newline at end of file