scope golf

gistfile1.rb

  def self.define_scopes(&block)
    class_eval do
      missing = method(:method_missing)
      undef :method_missing

      def self.method_missing(method, *args, &block)
        scope method, block
      end

      block.call

      singleton_class.send(:redefine_method, :method_missing, &missing)
    end
  end

  define_scopes do
    by_building { |b| where(building: b) }
    by_something_else { limit(5) }
  end