Handy tip for using proxy_owner in named scopes

gistfile1.rb

class Thing < ActiveRecord::Base
  # This named scope is supposed to take in an instance of Owner so that it can be used.  Normally people would start
  # writing `Thing.something(Owner.first).first` but ...
  named_scope :something, lambda { |owner|
    # Something here using 'owner'
  }
end

class Owner < ActiveRecord::Base
  # ... this association uses the method_missing behaviour of associations to cheat the appearance of something.  In 
  # other words, you can do `Owner.first.things.something.first` which is far nicer.
  has_many :things do
    def something
      super(proxy_owner)
    end
  end
end