Ruby on Rails

In Rails < 3, I could have a validation on model such as:

validates_presence_of :name, :message => "some custom message here"

If I try something similar in Rails 3:

validates :name, :presence => true , :message => "some other custom
message"

obviously, it throws an exception. So the question is, in Rails 3, how
to you give a simple custom message? Do I need to go through and set up
a custom validation class for each validation, just to show a different
message? I've looked at:

http://www.railsapi.com/doc/rails-v3.0.0/classes/ActiveModel/Validations/ClassMethods.html#M003721

but it seems to show that a custom class would need to be set up for
each attribute of my models? I'm sure there's a shortcut, but have yet
to find it.

Thanks.
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