[Rails] Rails getting started guide: validates not working for me?

Hi everyone,

im pretty new to ruby/rails and have an issue with the getting started
tutorial on
http://guides.rubyonrails.org/getting_started.html

The model should be extended by this:

class Post < ActiveRecord::Base
validates :name, :presence => true
validates :title, :presence => true,
:length => { :minimum => 5}
end

Now when i enter this into the console

p = Post.new(:content => "A new post")

i get this:
ArgumentError: Range unspecified. Specify the :within, .......

That is not supposed to happen. Rails is 3.0.5, ruby is 1.8.7, so i
dont see a problem there....
When i change validates to validate, it creates a record with empty
values and saves it (thought of a typo, but obviously wasnt).

Im really confused. Does anybode have an idea?

Thanks for your help,
Gerd

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