Here is the tutorial I'm following: http://rhnh.net/2011/01/31/yaml-tutorial
I'm using the SettingsLogic gem: https://github.com/binarylogic/settingslogic
And every config file used by Settings logic works fine, but if I use the same tactics on database.yml or thinking_sphinx.yml it will not work.
My bad I didn't specified full stack info.
I'm using passenger. But I missed directive RailsEnv
in apache config file.
http://www.modrails.com/documentation/Users%20guide%20Apache.html#rails_env
By default, passenger loads production environment.
Setting RailsEnv staging
solved my problem. And now correct settings picked.