Rails - Oct 2006 - Model class objects that are not columns in the database

I have a model Day with table days and column date, which holds a ruby 
and mysql date object respectively.  How do I create a model object, 
date.year, without creating a column ''year'' in the data table,
days?
How do I create this global class variable in the model from an 
encasulated data field?  Will this give me the dynamic find method, 
find_by_year?

Sam

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The following code is surely not working as it is, as i cant even
remember the proper format of a DATE column in mysql from the top of my
head, but maybe it helps to push you in the rioght direction:

def find_by_year(year)
 find :all, :conditions => ["date >= ''?-01-01'' AND
date <''?-12-31''",year,year]
end

def year
self.date.year
end

that should enable you to do something like:

Model.find_by_year(2001)

and

SomeModelInstance.year


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