Comments for Paperfuse.com

Comment on Distinct Values by Jim

Jim — Fri, 25 Sep 2009 18:11:57 +0000

Without testing, I’m not entirely sure if it would work or not. However, I know it does work with self.distinct_values. I placed self. because this is a class method mixed into the ActiveRecord Class. All inheritied classes will now have this method. So this will allow Child <(of) ActiveRecord::Base to call distinct values.

Comment on Distinct Values by linhe

linhe — Fri, 25 Sep 2009 06:57:07 +0000

sorry for post again, it seems I forgot to format the code plz clean it up for me.

        (class < "DISTINCT #{column}").map{|x| x.send(column)} if column_names.include?(column)
          end
        end

Comment on Distinct Values by linhe

linhe — Fri, 25 Sep 2009 06:55:04 +0000

Thanks for the post. Nice thoughts!

one question regarding this part of the code

(class < “DISTINCT #{column}”).map{|x| x.send(column)} if column_names.include?(column)
end
end

should it be without ’self.’ here? def distinct_values(column) … the eigen class of ActiveRecord would be Class#ActiveRecord. maybe I’m missing something?

Comment on Distinct Values by Charles

Charles — Mon, 16 Mar 2009 23:32:18 +0000

ok, cool i think that answers my very vague question. By saying you “mix in” this method it means the base object has the method, so all other models can easily override or extend that method.

Comment on Distinct Values by Jim

Jim — Sun, 15 Mar 2009 17:40:26 +0000

in the case of ActiveRecord module (its already being included). When I extend my ‘base’ which is the where this module is included. I believe in ActiveRecord::Base. Then all inherited classes and there instances receive this method.

Comment on Distinct Values by Charles

Charles — Sun, 15 Mar 2009 09:03:59 +0000

So by doing this:

def self.included(base) # include this into the base of the class instance

The method is defined in the parent class for all extending classes. And you can easily override / extend this method in all those extending classes?

Comment on Starting Back. by Charles

Charles — Thu, 12 Mar 2009 00:30:51 +0000

I’m learning…something already