Refactor ActiveRecord::Base.reset_subclasses to #reset, and add global...

Refactor ActiveRecord::Base.reset_subclasses to #reset, and add global observer resetting.  [Rick Olson]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4683 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Refactor ActiveRecord::Base.reset_subclasses to #reset, and add global observer resetting.  [Rick Olson]
+
 * Formally deprecate the deprecated finders. [Koz]
 
 * Formally deprecate rich associations.  [Koz]

activerecord/lib/active_record/base.rb

@@ -272,6 +272,10 @@ def self.inherited(child) #:nodoc:
       super
     end
     
+    def self.reset
+      reset_subclasses
+    end
+    
     def self.reset_subclasses #:nodoc:
       nonreloadables = []
       subclasses.each do |klass|

activerecord/lib/active_record/observer.rb

@@ -4,10 +4,18 @@
 module ActiveRecord
   module Observing # :nodoc:
     def self.included(base)
-      base.extend(ClassMethods)
+      class << base
+        include ClassMethods
+        alias_method_chain :reset, :observers
+      end
     end
 
     module ClassMethods
+      def reset_with_observers # :nodoc:
+        reset_without_observers
+        instantiate_observers
+      end
+      
       # Activates the observers assigned. Examples:
       #
       #   # Calls PersonObserver.instance
@@ -19,7 +27,13 @@ module ClassMethods
       #   # Same as above, just using explicit class references
       #   ActiveRecord::Base.observers = Cacher, GarbageCollector
       def observers=(*observers)
-        observers.flatten.each do |observer|
+        @observers = observers.flatten
+      end
+
+      # Instantiate the global ActiveRecord observers
+      def instantiate_observers
+        return if @observers.blank?
+        @observers.each do |observer|
           if observer.respond_to?(:to_sym) # Symbol or String
             observer.to_s.camelize.constantize.instance
           elsif observer.respond_to?(:instance)