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-rw-r--r--activesupport/lib/active_support/callbacks.rb4
-rw-r--r--activesupport/lib/active_support/concern.rb35
2 files changed, 38 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index 1c7802f7de..adabdd3388 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -568,7 +568,9 @@ module ActiveSupport
#
# would trigger <tt>Audit#before_save</tt> instead. That's constructed by calling
# <tt>"#{kind}_#{name}"</tt> on the given instance. In this case "kind" is "before" and
- # "name" is "save".
+ # "name" is "save". In this context treat ":kind" and ":name" as special thing where
+ # ":kind" refers to "callback type(before/after)" and ":name" refers to the method on
+ # which callbacks are being defined.
#
# A declaration like
#
diff --git a/activesupport/lib/active_support/concern.rb b/activesupport/lib/active_support/concern.rb
index eb31f7cad4..408d327dd7 100644
--- a/activesupport/lib/active_support/concern.rb
+++ b/activesupport/lib/active_support/concern.rb
@@ -1,3 +1,38 @@
+# A typical module looks like this
+#
+# module M
+# def self.included(base)
+# base.send(:extend, ClassMethods)
+# base.send(:include, InstanceMethods)
+# scope :foo, :conditions => {:created_at => nil}
+# end
+#
+# module ClassMethods
+# def cm; puts 'I am class method'; end
+# end
+#
+# module InstanceMethods
+# def im; puts 'I am instance method'; end
+# end
+# end
+#
+# By using <tt>ActiveSupport::Concern</tt> above module could be written as:
+#
+# module M
+# extend ActiveSupport::Concern
+#
+# included do
+# scope :foo, :conditions => {:created_at => nil}
+# end
+#
+# module ClassMethods
+# def cm; puts 'I am class method'; end
+# end
+#
+# module InstanceMethods
+# def im; puts 'I am instance method'; end
+# end
+# end
module ActiveSupport
module Concern
def self.extended(base)