Hi

Rails can handle that validation straight out of the box, and in one line too:

validates_length_of :variable, :within =>  3..40, :allow_nil => true,
:on =>  :update

Regards

Elliot

On 09/09/05, Derek Haynes <derek.haynes@[...].com>  wrote:
>  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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>  Rails@[...].org
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> 
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