Add an attribute reader method for ActiveRecord::Base.observers [Rick Olson]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5211 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Add an attribute reader method for ActiveRecord::Base.observers [Rick Olson]
+
 * Deprecation: count class method should be called with an options hash rather than two args for conditions and joins.  #6287 [Bob Silva]
 
 * has_one associations with a nil target may be safely marshaled.  #6279 [norbauer, Jeremy Kemper]

activerecord/lib/active_record/observer.rb

@@ -18,10 +18,18 @@ module ClassMethods
       #
       #   # Same as above, just using explicit class references
       #   ActiveRecord::Base.observers = Cacher, GarbageCollector
+      #
+      # Note: Setting this does not instantiate the observers yet.  #instantiate_observers is
+      # called during startup, and before each development request.  
       def observers=(*observers)
         @observers = observers.flatten
       end
 
+      # Gets the current observers.
+      def observers
+        @observers ||= []
+      end
+
       # Instantiate the global ActiveRecord observers
       def instantiate_observers
         return if @observers.blank?