ruby on rails named scope implementation

Question

From the book Agile Web Development With Rails

class Order < ActiveRecord::Base
   named_scope :last_n_days, lambda { |days| {:conditions =>
      [\'updat         


        

Answer 1

You might want to try this

class Order < ActiveRecord::Base

  class << self
    def last_n_days(n)
      scoped(:conditions => ['updated < ?', days])
    end
    def checks
      scoped(:conditions => {:pay_type => :check})
    end
  end

end

usage is the same

@orders = Order.last_n_days(5)
@orders = Order.checks
@orders = Order.checks.last_n_days(5)

This still does all the lazy loading you love. That is, it won't make a query until you attempt to access the records. Bonus: Rails 3 compatible!

Named Scopes Are Dead