a will_paginate extension

gistfile1.txt

module WillPaginate
  class Collection
    # This is a special case of paginate() for _dubstep_ fans (_hyper-dubstep_ not supported). 
    # It is different in this regard:
    #   * The first page should load +first_per_page+ records
    #   * The rest of the pages should load +more_per_page+ records
    #
    # NOTE: will_paginate view helpers not really tested with this (eg the '1,2,3...N' thing)
    #
    def self.dubstep_paginate(finder, page = 1, first_per_page = 15, more_per_page = 15, finder_opts = {})
      page = [page.to_i, 1].max
      per_page = page == 1 ? first_per_page : more_per_page

      WillPaginate::Collection.create(page, per_page, finder.count(finder_opts)) do |pager|
        # Dubstep-remix of total_pages
        total_pages = case pager.total_entries
                      when 0 then 0
                      when (1..3) then 1
                      else ((pager.total_entries - 3) / more_per_page).succ.succ
                      end
        pager.instance_variable_set(:@total_pages, total_pages)

        pager.replace(finder.all(finder_opts.update({
          :limit => pager.per_page, 
          :offset => pager.dubstep_offset
        })))
      end
    end
  
    def dubstep_offset
      current_page > 1 ? (current_page.pred.pred * per_page) + 3 : 0
    end
  end
end