my crap metaprogramming

frustrating

# so I want to dry up this kind of method, which occurs only four times, but since I anticipate using this construct a few more times, and page.rb is looking long, the effort of metaprogramming seems worthwhile

# with I guess moving the defn of spec attr acessor out into an included module

# so here is the code to dry, shown for categories

def categories=(c)
    if history.last.try(:new_record?)
      history.last.categories = c
    else
      history.new(categories: c)
    end
  end

---------------

# I think I can rewrite this as the following

  def self.special_attr_accessor(attr, set: rhs)

    define_method "#{attr}=" do |rhs|
      if history.last.try(:new_record?)
        history.last.instance_variable_set "@#{attr}", set.(rhs)
      else
        history.new("#{attr}=": set.(rhs))
      end
    end

  end

----------------------------

# and to add this getter

  def categories
    history.last.try(:categories)
  end

# i add in a suitable spot

  define_method "#{attr}" do
    history.last.try("#{attr}")
  end

------------------

Then I call as

special_attr_accessor :categories, set: ->(val){val}
special_attr_accessor :tags,       set: ->(val){val}
#  ... creator ... tags

though can the stab be removed here?