Rails - Dec 2005 - undefined local variable or method `errors' for Listing:Clas

I have a listing model in which I''m trying to validate a date (2005, 2,
29 - is not a valid date).

  def self.validate_date(year, month, day)
    unless Date::valid_date?(year.to_i, month.to_i, day.to_i)
      errors.add(:start_date, "De startdatum moet geldige datum
zijn.")
    end
  end

But everytime I call this code I get:

undefined local variable or method `errors'' for Listing:Class

Looking on the internet and in the Rails book errors.add should work and 
should raise an error in the view. Anybody any ideas?

Kind regards

Nick

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Nick Snels wrote:
> I have a listing model in which I''m trying to validate a date
(2005, 2,
> 29 - is not a valid date).
> 
>   def self.validate_date(year, month, day)
>     unless Date::valid_date?(year.to_i, month.to_i, day.to_i)
>       errors.add(:start_date, "De startdatum moet geldige datum
zijn.")
>     end
>   end
> 
> But everytime I call this code I get:
> 
> undefined local variable or method `errors'' for Listing:Class
errors is an instance method.  Remove the "self." and
call validate_date on the object you are validating.


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