Wasn't named_scope a plugin before it was in 2.1?
On Aug 14, 1:35 pm, ben wiseley <[email protected]> wrote:
> I screwed up my example if it matters... should have gone more like:
>
> Class Area < ActiveRecord::Base
> def taxes
> return .1
> end
>
> def calc_price(amount)
> amount + (amount * determine_taxes)
> end
> end
>
> class InnerCity < Area
> def self.find(*args)
> super(args.first,
> args.extract_options!.merge(:conditions=>{:postcode=>[2001, 2002]})
> end
>
> def taxes
> return .5 + new_bridge_tax
> end
>
> end
>
> Area.new.calc_price(3)
> InnerCity.new.calc_price(3)
>
> etc.
>
> On Thu, Aug 13, 2009 at 8:28 PM, Sonia Hamilton <[email protected]> wrote:
> > Thanks everyone for all your suggestions. I'm using Ben's method as it
> > works best for my scenario, but I'll file away the techniques for future
> > use.
>
> > My old rails doesn't have extract_options, so I broke this up into a few
> > lines:
>
> > options = args.last.is_a?(Hash) ? args.last : {}
> > options = options.merge(:conditions=> ...
> > super(args.first, options)
>
> > --
> > Sonia Hamilton.
>
> > ben wiseley wrote:
>
> > I think it really depends on what's needed. If you simply need to filter
> > rows then, yes, the solution below is good. But, if you need custom logic
> > for InnerCity vs Rural then I'd sub class the models like you originally
> > suggested.
>
> > Class Area < ActiveRecord::Base
> > def taxes
> > return .1
> > end
>
> > def calc_price(amount)
> > amount + (amount * determine_taxes)
> > end
> > end
>
> > class InnerCity < ActiveRecord:Base
> > def self.find(*args)
> > super(args.first,
> > args.extract_options!.merge(:conditions=>{:postcode=>[2001, 2002]})
> > end
>
> > def taxes
> > return .5 + new_bridge_tax
> > end
>
> > def calc_price(amount)
> > amount + (amount * determine_taxes)
> > end
> > end
>
> > etc.
>
> > On Thu, Aug 13, 2009 at 6:27 PM, Dylan Egan <[email protected]> wrote:
>
> >> It would go in the model.
>
> >> class Location < ActiveRecord::Base
> >> def self.all_from_inner_city
> >> find(:all, :conditions=>{:postcode=>[2001, 2002]})
> >> end
> >> end
>
> >> Location.all_from_inner_city
>
> >> or
>
> >> class Location < ActiveRecord::Base
> >> def self.from_inner_city(*args)
> >> find(args.first,
> >> (args.extract_options!.merge(:conditions=>{:postcode=>[2001, 2002]}))
> >> end
> >> end
>
> >> Location.from_inner_city(:all, :order => 'id DESC')
> >> Location.from_inner_city(:first)
>
> >> Cheers,
>
> >> Dylan.
>
>
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