From 3bab575316d919d1d51b9384f76f73cbcb0971e9 Mon Sep 17 00:00:00 2001
From: Nicholas Seckar <nseckar@gmail.com>
Date: Sun, 26 Mar 2006 20:00:40 +0000
Subject: Update Object.subclasses_of to locate nested classes. Update
 Object.remove_subclasses_of to use Class.remove_class.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4049 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 activesupport/CHANGELOG                            |  4 ++++
 .../active_support/core_ext/object/extending.rb    | 11 +++++----
 .../test/core_ext/object_and_class_ext_test.rb     | 27 ++++++++++++++++++++--
 3 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index 7978626fe6..9852e4a5fb 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,9 @@
 *SVN*
 
+* Update Object.subclasses_of to locate nested classes. This affects Object.remove_subclasses_of in that nested classes will now be unloaded. [Nicholas Seckar]
+
+* Update Object.remove_subclasses_of to use Class.remove_class, reducing duplication. [Nicholas Seckar]
+
 * Added Fixnum#seconds for consistency, so you can say 5.minutes + 30.seconds instead of 5.minutes + 30 #4389 [François Beausoleil]
 
 * Added option to String#camelize to generate lower-cased camel case by passing in :lower, like "super_man".camelize(:lower) # => "superMan" [DHH]
diff --git a/activesupport/lib/active_support/core_ext/object/extending.rb b/activesupport/lib/active_support/core_ext/object/extending.rb
index 9abdfc0bc9..16f62d85b7 100644
--- a/activesupport/lib/active_support/core_ext/object/extending.rb
+++ b/activesupport/lib/active_support/core_ext/object/extending.rb
@@ -1,14 +1,17 @@
 class Object #:nodoc:
   def remove_subclasses_of(*superclasses)
-    subclasses_of(*superclasses).each do |subclass|
-      Object.send(:remove_const, subclass.to_s) rescue nil
-    end
+    Class.remove_class(*subclasses_of(*superclasses))
   end
 
   def subclasses_of(*superclasses)
     subclasses = []
     ObjectSpace.each_object(Class) do |k|
-      next if (k.ancestors & superclasses).empty? || superclasses.include?(k) || k.to_s.include?("::") || subclasses.include?(k) || !Object.const_defined?(k.to_s.to_sym)
+      next if # Exclude this class if
+        (k.ancestors & superclasses).empty? || # It's not a subclass of our supers
+        superclasses.include?(k) || # It *is* one of the supers
+        subclasses.include?(k) || # We already have it for some obscure reason
+        eval("! defined?(::#{k})") || # It's not defined.
+        eval("::#{k}").object_id != k.object_id
       subclasses << k
     end
     subclasses
diff --git a/activesupport/test/core_ext/object_and_class_ext_test.rb b/activesupport/test/core_ext/object_and_class_ext_test.rb
index 6a100e813b..a1e5ea79db 100644
--- a/activesupport/test/core_ext/object_and_class_ext_test.rb
+++ b/activesupport/test/core_ext/object_and_class_ext_test.rb
@@ -10,6 +10,13 @@ class ClassD < ClassA; end
 class ClassI; end
 class ClassJ < ClassI; end
 
+class ClassK
+end
+module Nested
+  class ClassL < ClassK
+  end
+end
+
 module Bar
   def bar; end
 end
@@ -40,6 +47,22 @@ class ClassExtTest < Test::Unit::TestCase
     ClassI.remove_subclasses
     assert_equal [], Object.subclasses_of(ClassI)
   end
+  
+  def test_subclasses_of_should_find_nested_classes
+    assert Object.subclasses_of(ClassK).include?(Nested::ClassL)
+  end
+  
+  def test_subclasses_of_should_not_return_removed_classes
+    # First create the removed class
+    old_class = Nested.send :remove_const, :ClassL
+    new_class = Class.new(ClassK)
+    Nested.const_set :ClassL, new_class
+    assert_equal "Nested::ClassL", new_class.name # Sanity check
+    
+    subclasses = Object.subclasses_of(ClassK)
+    assert subclasses.include?(new_class)
+    assert ! subclasses.include?(old_class)
+  end
 end
 
 class ObjectTests < Test::Unit::TestCase
@@ -55,9 +78,9 @@ class ObjectTests < Test::Unit::TestCase
  
   def test_extended_by
     foo = Foo.new
-    assert_equal [Bar], foo.extended_by
+    assert foo.extended_by.include?(Bar)
     foo.extend(Baz)
-    assert_equal %w(Bar Baz), foo.extended_by.map {|mod| mod.name}.sort
+    assert ([Bar, Baz] - foo.extended_by).empty?, "Expected Bar, Baz in #{foo.extended_by.inspect}"
   end
   
   def test_extend_with_included_modules_from
-- 
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