Rails - Jan 2006 - how to get column_for_attribute?

Hi all,
In the code below I don''t understand:
1. Why I have to prepend overriden method content_columns with "self."
to get it working?
2. Why column_for_attribute method is not working (no such method?) even 
if SomeTable is subclass of ActiveRecord::Base which have public 
column_for_attribute method?
> class SomeTable < ActiveRecord::Base
>
>   def self.content_columns
>     column = column_for_attribute(''sometable_id'')
>     super
>   end
> end
Any help is appreciated.
Bojan Mihelac

-- 
Bojan Mihelac
Informatika Mihelac, Bojan Mihelac s.p.  |  www.informatikamihelac.com
-> tools, scripts, tricks from our code lab: http://source.mihelac.org

I am come with these conclusions so far, please :
> 1. Why I have to prepend overriden method content_columns with
"self."
> to get it working?
''content_columns'' is class method of ActiveRecord::Base, so it
should be
defined as:
> def Base.content_columns 
if we want to override it, right?
> 2. Why column_for_attribute method is not working (no such method?) 
> even if SomeTable is subclass of ActiveRecord::Base which have public 
> column_for_attribute method?
''content_columns'' is a class method and cannot call  
''column_for_attribute'' which is object method, right?
However, this would work:
> column = columns_hash[''sometable_id'']
And original example:
>> class SomeTable < ActiveRecord::Base
>>
>>   def self.content_columns
>>     column = column_for_attribute(''sometable_id'')
>>     super
>>   end
>> end

-- 
Bojan Mihelac
Informatika Mihelac, Bojan Mihelac s.p.  |  www.informatikamihelac.com
-> tools, scripts, tricks from our code lab: http://source.mihelac.org