I'd like to validate that the length of text is within a specified
range, but only if the text is not nil.

To do this, I'd like to setup a custom validation:

def validate_on_update
   validate_within_range_if_not_nil
end

Where  validate_within_range_if_not_nil would first check if the text
is nil, and if not, then use the validation helper
#validates_length_of.

However, I don't know how to call this method from within a custom
validation method. I tried:

ActiveRecord::Validations::ClassMethods::validates_length_of

But received a NoMethodError.

Any ideas on implementing this type of validation?
-- 
Derek Haynes
HighGroove Studios - http://www.highgroove.com
Keeping it Simple.
404.593.4879
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