Rails - Aug 2006 - Extend ActiveRecord::Base

Hi,

I want to exten ActiveRecord::Base with own methods:

class Stock < ActiveRecord::Base
def compare_own
  ...
end
end

But call Stock.compare_own fails:
NoMethodError: undefined method `compare_own'' for Calendar:Class
    /var/lib/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1129:in
`method_missing''

But why?

I want to use only ActiveRecord from RoR, I hope this isn''t a problem.

Best regards,
Tomas

-- 
Posted via http://www.ruby-forum.com/.

Tomas Fischer wrote:
> class Stock < ActiveRecord::Base
> def compare_own
>   ...
> end
> end
> 
> But call Stock.compare_own fails:
> NoMethodError: undefined method `compare_own'' for Calendar:Class
>    
/var/lib/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1129:in
> `method_missing''
You''ve defined an instance method but you''re trying to call it
as a
class method.

Given your current code, you have to have an instance of Stock before 
you can call your method:

s = Stock.new   # or s = Stock.find(:first), etc.
s.compare_own

If you really mean it to be a class method, then you can define it like 
this:

def self.compare_own
 ...
end

Does this help?

Jeff
www.softiesonrails.com

-- 
Posted via http://www.ruby-forum.com/.

On Aug 11, 2006, at 7:09 PM, Tomas Fischer wrote:
>
> class Stock < ActiveRecord::Base
> def compare_own
>   ...
> end
> end
>
> But call Stock.compare_own fails:
> NoMethodError: undefined method `compare_own'' for Calendar:Class
>     /var/lib/gems/1.8/gems/activerecord-1.14.4/lib/active_record/ 
> base.rb:1129:in
> `method_missing''
You defined an instance method, but called a class method.


Dave