Simple Decorator implementation for our projects

basic_decorator.rb

require 'delegate'

class BasicDecorator < SimpleDelegator
  def self.decorate(objects)
    case objects
    when Array
      objects.map { |object| new(object) }
    when ActiveRecord::Relation, DecoratedListProxy, ActiveRecord::Associations::CollectionProxy
      DecoratedListProxy.new(self, objects)
    else
      new(objects)
    end
  end

  def eql?(other)
    other.eql?(__getobj__)
  end

  def to_model
    __getobj__
  end

  def class
    __getobj__.class
  end

  class DecoratedListProxy < SimpleDelegator
    def initialize(decorator_class, list)
      super(list)
      @decorator_class = decorator_class
    end

    def to_a(*args)
      evaluate
    end

    def each(&block)
      evaluate.each(&block)
    end

    def map(&block)
      evaluate.map(&block)
    end

    def evaluate
      @evaluated_objects ||= __getobj__.map do |object|
        @decorator_class.new(object)
      end
    end
  end
end