From da2b05bb6b713a702eb0420079394bf273f1203e Mon Sep 17 00:00:00 2001
From: Tejas Dinkar <tejas@gja.in>
Date: Mon, 2 Dec 2013 10:20:43 +0530
Subject: Allows you to check if an attribute has changed to a particular value

model.name_changed?(from: "Pete", to: "Ringo")
---
 activemodel/lib/active_model/dirty.rb | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'activemodel/lib')

diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index 8ccb25c613..58d87e6f7f 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -54,6 +54,7 @@ module ActiveModel
   #   person.name = 'Bob'
   #   person.changed?       # => true
   #   person.name_changed?  # => true
+  #   person.name_changed?(from: "Uncle Bob", to: "Bob") # => true
   #   person.name_was       # => "Uncle Bob"
   #   person.name_change    # => ["Uncle Bob", "Bob"]
   #   person.name = 'Bill'
@@ -149,8 +150,11 @@ module ActiveModel
     end
 
     # Handle <tt>*_changed?</tt> for +method_missing+.
-    def attribute_changed?(attr) # :nodoc:
-      changed_attributes.include?(attr)
+    def attribute_changed?(attr, options = {}) #:nodoc:
+      result = changed_attributes.include?(attr)
+      result &&= options[:to] == __send__(attr) if options.key?(:to)
+      result &&= options[:from] == changed_attributes[attr] if options.key?(:from)
+      result
     end
 
     # Handle <tt>*_was</tt> for +method_missing+.
-- 
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