page_drop.rb

class PageDrop < Liquid::Drop
  def initialize(page)
    @page = page
  end
  
  def name
    @page.name
  end

  def children
    PagesDrop.new(page.children)
  end
end

pages_drop.rb

class PagesDrop < Liquid::Drop
  def initialize(pages)
    @pages = pages
  end

  def group_by
    GroupByDrop.new(@pages)
  end

  def all
    @pages.all
  end

  def size
    @pages.size
  end
end

In case you don't know, a drop is what the Liquid templating language uses to expose methods/data of a particular object (because you don't want the user to have full access to the system in the templating language).

I want to be able to do this:

@page_drop = PageDrop.new(@page)
@page_drop.children # to get an array of children

instead of

@page_drop.children.all