rails/rails — pull request #5879 by kennyj (2012-04-17 14:42:13+00:00)
Title: Fix #5847 and #4045. Force load AR::Base when observers are existed.

This PR closes #5847 and #4045.
Please see https://github.com/rails/rails/issues/4045.

I think this commits should be merged to 3-2-stable.

And the testcase only should be merged to master (already passed), because AR::Base is loaded initially.
meybe by https://github.com/rails/rails/commit/d0bb43d621c471659d03504f48f0197c0ae3b57c