When is the environment.rb file loaded in a rails 3 app?

I dont' see any reference 开发者_运维问答to my environment.rb file in my rails 3 app, I must be not looking at the right place.

Is it called differenlty now, I thought it was in /public/dispatch.rb?

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It's in config.ru. This is a Rack-up file, that any Rack complient server will load when starting the app. It contains something like this:

require ::File.expand_path('../config/environment',  __FILE__)
run YourApp::Application

The first line loads your environment. The second line tells the Rack server that your application is the Rack application to load.