Rails - Jun 2010 - How do I pass interpolation variables to AR validations?

(Rails 2.3.8)

Say I have in config/locales/en.yml:

en:
  activerecord:
    attributes:
      foo:
        bar: ''Long%{br}name''

Now, in HTML I can do:
t(:''activerecord.attributes.foo.bar'', :br =>
''<br/>'')

and in LaTeX:
t(:''activerecord.attributes.foo.bar'', :br =>
''\\\\'')

However, this is doomed to fail with AR validations, e.g.:

# Model
class Foo < ActiveRecord::Base
  validates_presence_of :bar
end

# View Error
I18n::MissingInterpolationArgument in Foo#create
missing interpolation argument in "Long%{br}name"
({:count=>"1"} given)


So how do I pass :br to ''activerecord.attributes.foo.bar'' in
the context
of Foo?
Or is my approach wrong altogether?

Thank you
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Got this working by using Ruby hashes instead of YAML:

{
  :en => {
    :activerecord => {
      :attributes => {
        :foo => {
          :bar => lambda {|scope, opts| "Long#{opts[:br] || ''
''}name" }
        }
      }
    }
  }
}
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