ivars in clear!

remove ruby 1.8 checking in constantize method

Fix rails/generators/base.rb documentation for hook_for

is one benefit of choosing composition over inheritance.

allow reorder to affect eager loading correctly

refactor AR::PredicateBuilder.build_from_hash

Rails template creation issue

This reverts commit 90df0d4f, reversing
changes made to 5e6fc81d.

Reason: build breakage

This is the 'top level' connection, inherited by any models that include
ActiveRecord::Model or inherit from ActiveRecord::Base.

The problem: We need to be able to specify configuration in a way that
can be inherited to models that include ActiveRecord::Model. So it is
no longer sufficient to put 'top level' config on ActiveRecord::Base,
but we do want configuration specified on ActiveRecord::Base and
descendants to continue to work.

So we need something like class_attribute that can be defined on a
module but that is inherited when ActiveRecord::Model is included.

The solution: added ActiveModel::Configuration module which provides a
config_attribute macro. It's a bit specific hence I am not putting this
in Active Support or making it a 'public API' at present.

deprecate Base64.encode64s from AS

Further simplify singleton_class checking in class_attribute