Hidden Features of Ruby on Rails [closed]

Answer 1

If you have a model with some class methods and some named scopes:

class Animal < ActiveRecord::Base
  named_scope 'nocturnal', :conditions => {'nocturnal' => true}
  named_scope 'carnivorous', :conditions => {'vegetarian' => true}

  def self.feed_all_with(food)
    self.all.each do |animal|
      animal.feed_with(food)
    end
  end
end

Then you can call the class methods through the named scope:

if night_time?
  Animal.nocturnal.carnivorous.feed_all_with(bacon)
end