Cannot use decorator methods in decorator

[wenbo]

It's okay to use decorator methods in actionview,
but just like the following case, if I use decorator method in other decorator, it will be confronted with error.

it will be wonderful if it's possible to use decorator methods in decorator. that's the feature that needed in my situation.
Any ideas please.

module ClassADecorator
  def mtd_a
    "this is mtd a"
  end
end

module ClassBDecorator
  def mtd_b
    # error, undefined method `mtd_a' for #<ClassA>
    ClassA.new.mtd_a 
  end
end

[vendethiel]

The readme mentions:

ActiveDecorator::Decorator.instance.decorate(ClassA.new).mtd_a

[wenbo]

@vendethiel

thanks for your reply.
just because there are so many ClassA.new.mtd_a, so what I need is without decorate manually, it's able to use decorator methods in decorator by default.