From 33d7a6bc55a983ea690961d3a434096fe80d0fca Mon Sep 17 00:00:00 2001
From: Vishnu Atrai <vishnu.atrai@gmail.com>
Date: Fri, 5 Aug 2011 14:35:04 +0530
Subject: [PATCH] ActiveModel::Callbacks basic guide

---
 .../guides/source/active_model_basics.textile | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/railties/guides/source/active_model_basics.textile b/railties/guides/source/active_model_basics.textile
index 87a9658a94..e4c84365d3 100644
--- a/railties/guides/source/active_model_basics.textile
+++ b/railties/guides/source/active_model_basics.textile
@@ -45,7 +45,31 @@ person.age_highest?  # false
 
 h4. Callbacks
 
+Callbacks gives Active Record style callbacks. This provides the ability to define the callbacks and those will run at appropriate time. After defining a callbacks you can wrap with before, after and around custom methods.
 
+<ruby>
+class Person
+  extend ActiveModel::Callbacks
+
+  define_model_callbacks :update
+
+  before_update :reset_me
+
+  def update
+    _run_update_callbacks do
+      puts 'saving...'
+    end
+  end
+
+  def reset_me
+    puts 'before saving...'
+  end
+end
+
+person = Person.new
+person.update # before saving...
+              # saving...
+</ruby>
 
 h3. Changelog