rails/rails — pull request #6638 by frodsan (2012-06-05 15:58:59+00:00)
Title: add instance_accessor option to config_accesor

Changes:

* Add `instance_accessor` option to opt out of the instance writer and
instance reader methods.
* Raises a NameError if the name of the attribute is not valid.
* Update documentation and tests.
* Add CHANGELOG entry in activesupport.