From: Dave Rolsky <autarch@urth.org>
Date: Wed, 5 Jun 2013 16:33:35 +0000 (-0500)
Subject: Clarify how to check whether old value is passed to a trigger
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=0f1b9555cfda7afaaf652f1a9eef2d8fa89257a9;p=gitmo%2Fmoose-presentations.git

Clarify how to check whether old value is passed to a trigger
---

diff --git a/moose-class/exercises/t/06-advanced-attributes.t b/moose-class/exercises/t/06-advanced-attributes.t
index e2b13e3..1583334 100644
--- a/moose-class/exercises/t/06-advanced-attributes.t
+++ b/moose-class/exercises/t/06-advanced-attributes.t
@@ -17,7 +17,8 @@
 # Use a trigger to record the _old value_ of the balance each time it
 # changes. This means your trigger should not do anything if it is not passed
 # an old value (this will be the case when the attribute is set for the first
-# time).
+# time). You can check for the presence of an old value by looking at the
+# number of elements passed to the trigger in the @_ array.
 #
 # Now you can delete the HasAccount role entirely. Instead, add an "account"
 # attribute to Person directly.