gistfile1.rb

# encoding: utf-8

class Depot
  attr_accessor :entries

  def self.construct(&block)
    new.tap do |depot|
      depot.entries = {}
      depot.instance_eval(&block)
    end
  end

  def create(attributes = {})
    puts "quem é o model do method_missing? :("
    puts attributes.inspect
  end

  def models
    @models ||= [:groups]
  end

  def method_missing(name, &block)
    if models.include? name
      instance_eval(&block)
    else
      super
    end
  end
end

Depot.construct do

  groups do
    create :teste => "hello world", :as => :hello
  end

end