def each(&block)
      @ids.each_slice(@page_size) do |page_of_ids|
        resources = @paging_block.call(page_of_ids)
        resources.each(&block)
      end
    end
def each(&block)
      @ids.each_slice(@page_size) do |page_of_ids|
        resources = @paging_block.call(page_of_ids)
        resources.each(&block)
      end
    end
Yields each item