kaminari--kaminari/lib/kaminari/models/page_scope_methods.rb

module Kaminari
  module PageScopeMethods
    # Specify the <tt>per_page</tt> value for the preceding <tt>page</tt> scope
    #   Model.page(3).per(10)
    def per(num)
      if (n = num.to_i) <= 0
        self
      elsif max_per_page && max_per_page < n
        limit(max_per_page).offset(offset_value / limit_value * max_per_page)
      else
        limit(n).offset(offset_value / limit_value * n)
      end
    end

    def padding(num)
      offset(offset_value + num.to_i)
    end

    # Total number of pages
    def total_pages
      (total_count.to_f / limit_value).ceil
    end
    #FIXME for compatibility. remove num_pages at some time in the future
    alias num_pages total_pages

    # Current page number
    def current_page
      (offset_value / limit_value) + 1
    end

    # First page of the collection ?
    def first_page?
      current_page == 1
    end

    # Last page of the collection?
    def last_page?
      current_page >= total_pages
    end
  end
end