Rails - Jul 2007 - AR validates_uniqueness_of's :message

Hello,

Can anybody give me a hint on the format of :message? I have:

  validates_uniqueness_of :username, :scope => :group, :case_sensitive
=> false,
    :message => "%{fn} already exists in %{fn}."

I get "Userame already exists in Userame." Yuck!

When creating a duplicate with create(:username => ''userA'',
:group =>
''groupB''), how can I make it "userA already exists in
groupB."  ???

By the way, where are the :message format and the usage of %{fn} and %d
documented? I''ve tried AWDWR 2nd ed., PickAxeII and Rails docs...

Thanks in advance!
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Does anybody know where the usage %{fn} and %d in :message are 
documented?

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