[Rails] How can I force require a file in the console?

I use rails-3.0.0.beta3 and ruby-1.9.2-preview3.

I have defined some new methods in the application_controller.rb, and
need to test them in the consle.

If I changed some codes in the application_controller.rb.
I should always restart the console.

I have tried to use 'reload!' command, just dosen't work.

And then I use "require 'applicatioin.rb'",
still dosen't work.

Help! :(

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