gistfile1.rb

class Core::PaginationSerializer < ActiveModel::ArraySerializer
  def initialize(object, options={})
    meta_key = options[:meta_key] || :meta
    options[meta_key] ||= {}

    pobject = options[:pagination_object] || object

    options[meta_key][:pagination] = {
      current_page: pobject.current_page,
      next_page: pobject.next_page,
      prev_page: pobject.prev_page,
      total_pages: pobject.total_pages,
      total_count: pobject.total_count
    }
    super(object, options)
  end
end

This is for Kaminari (pagination gem) and AMS