Reverse pagination

reverse_pagination.rb

class ReversePagination
  attr_reader :page, :per_page, :total_count, :total_pages, :records

  def initialize(scope, page)
    initialize_params(scope.klass, page)

    @records = scope.limit(limit).offset(offset).order(:created_at).reverse
  end

  def initialize_params(klass, page)
    @per_page = klass::PER_PAGE
    @total_count = klass.count
    @total_pages = total_count / per_page
    @page = page.to_i
    @page = total_pages if @page <= 0 || @page > total_pages
  end

  def limit
    per_page + 1 / (total_pages - page + 1) * (total_count % per_page)
  end

  def offset
    (page - 1) * per_page
  end
end

users_controller.rb

class UsersController < ApplicationController
  def index
    @users = reverse_paginate User.includes(:likes), params[:page]
  end

  private

  def reverse_paginate(scope, page)
    @paginator = ReversePagination.new(scope, page)

    @paginator.records
  end
end