From 95a938a5e69a0513a3666f5979be2460fa717885 Mon Sep 17 00:00:00 2001
From: Francesco Rodriguez <lrodriguezsanc@gmail.com>
Date: Thu, 21 Jun 2012 16:19:40 -0500
Subject: add example to
 ActiveModel::AttributeMethods#undefine_attribute_methods [ci skip]

---
 activemodel/lib/active_model/attribute_methods.rb | 26 +++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'activemodel/lib/active_model')

diff --git a/activemodel/lib/active_model/attribute_methods.rb b/activemodel/lib/active_model/attribute_methods.rb
index 96d44e3b0d..a869991280 100644
--- a/activemodel/lib/active_model/attribute_methods.rb
+++ b/activemodel/lib/active_model/attribute_methods.rb
@@ -245,6 +245,10 @@ module ActiveModel
       #
       #     attr_accessor :name
       #     attribute_method_suffix '_short?'
+      #
+      #     # Call to define_attribute_method must appear after the
+      #     # attribute_method_prefix, attribute_method_suffix or
+      #     # attribute_method_affix declares.
       #     define_attribute_method :name
       #
       #     private
@@ -276,6 +280,28 @@ module ActiveModel
       end
 
       # Removes all the previously dynamically defined methods from the class
+      #
+      #   class Person
+      #     include ActiveModel::AttributeMethods
+      #
+      #     attr_accessor :name
+      #     attribute_method_suffix '_short?'
+      #     define_attribute_method :name
+      #
+      #     private
+      #
+      #     def attribute_short?(attr)
+      #       send(attr).length < 5
+      #     end
+      #   end
+      #
+      #   person = Person.new
+      #   person.name = 'Bob'
+      #   person.name_short? # => true
+      #
+      #   Person.undefine_attribute_methods
+      #
+      #   person.name_short? # => NoMethodError
       def undefine_attribute_methods
         generated_attribute_methods.module_eval do
           instance_methods.each { |m| undef_method(m) }
-- 
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