On Sep 22, 1:41 pm, dschruth <[EMAIL PROTECTED]> wrote:
> Lets just use your Magazine / Subscriber example for now.
>
> I want to do something like this:
> --------------------------------------------------------
> class Magazine
> def subscriber_salaries
> Subscriber.calculate(:sum, :salary, :conditions => "magazine_id =
> " + id.to_s) # PGError: ERROR: column "magazine_id" does not
> exist
> end
> end
You need to implement subscriber_salaries like this:
class Magazine
has_many :subscriptions
has_many :subscribers, :through => :subscriptions
def subscriber_salaries
subscribers.calculate(:sum, :salary)
end
end
-Dan
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