Sharing attributes in Ruby with a single `prepend` instead of e.g. `include` + `merge`. Proof of concept. Too implicit for my taste, I think.

sharing_attributes_with_prepend.rb

module SharedAttributes
  def attributes
    super.merge(shared: true)
  end
end

class FooAttributes
  prepend SharedAttributes

  def attributes
    { foo: true }
  end

  def speak
    p attributes
  end
end

class BarAttributes
  prepend SharedAttributes

  def attributes
    { bar: true }
  end

  def speak
    p attributes
  end
end

FooAttributes.new.speak  # { foo: true, shared: true }
BarAttributes.new.speak  # { bar: true, shared: true }