NullUser written in meta-programming

null_user.rb

class NullUser
  User.reflections.each do |key, value|
    name = key.to_s

    if value.collection?
      eval <<-RUBY
        def #{name}
          #{value.klass}.none
        end

        def #{name.singularize}_ids
          []
        end
      RUBY
    else
      eval <<-RUBY
        def #{name}
          nil
        end

        def #{name}_id
          nil
        end

        def build_#{name}(*args, &block)
          nil
        end

        def create_#{name}(*args, &block)
          nil
        end

        def create_#{name}!(*args, &block)
          nil
        end
      RUBY
    end
  end
end