This would be helpful when handling an Array object for the kaminari gem.

kaminar_array.rb

if defined?(Kaminari)
  class Array
    # This would be helpful when handling an Array object that
    # has a different count value from actual count.
    #
    # Example:
    #   arr = ['a', 'b', 'c', 'd', 'e']
    #
    #   paged = arr.paginate(total_count: 200).page(2)   #->  ['a', 'b', 'c', 'd', 'e']
    #   paged.total_count                                #->  200
    #   paged.current_page                               #->  2
    #
    #   paged = arr.paginate.page(2).per(2)              #->  ['c', 'd']
    #   paged.total_count                                #->  5
    #   paged.current_page                               #->  2
    #
    def paginate(options = {})
      page     = options[:page] || 1
      per_page = options[:per_page] || Kaminari.config.default_per_page
      total    = options[:total_count] || self.length

      if options[:total_count]
        Kaminari.paginate_array(self, total_count: total).page(page).per(per_page)
      else
        Kaminari.paginate_array(self).page(page).per(per_page)
      end
    end
  end
end