Module: Sequel::Dataset::Pagination

### Home Classes Methods

### In Files

- lib/sequel/extensions/pagination.rb

### Methods

- #current_page_record_count
- #current_page_record_range
- #first_page?
- #last_page?
- #next_page
- #page_range
- #prev_page
- #set_pagination_info

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# Sequel::Dataset::Pagination

Holds methods that only relate to paginated datasets. Paginated dataset have pages starting at 1 (page 1 is offset 0, page 1 is offset page_size).

### Attributes

current_page[RW]

The current page of the dataset, starting at 1 and not 0.

page_count[RW]

The number of pages in the dataset before pagination, of which this paginated dataset is one.

page_size[RW]

The number of records per page (the final page may have fewer than this number of records).

pagination_record_count[RW]

The total number of records in the dataset before pagination.

### Public Instance Methods

current_page_record_count() click to toggle source

Returns the number of records in the current page

    # File lib/sequel/extensions/pagination.rb, line 56
    def current_page_record_count
      return 0 if @current_page > @page_count

      a = 1 + (@current_page - 1) * @page_size
      b = a + @page_size - 1
      b = @pagination_record_count if b > @pagination_record_count
      b - a + 1
    end

current_page_record_range() click to toggle source

Returns the record range for the current page

    # File lib/sequel/extensions/pagination.rb, line 46
    def current_page_record_range
      return (0..0) if @current_page > @page_count

      a = 1 + (@current_page - 1) * @page_size
      b = a + @page_size - 1
      b = @pagination_record_count if b > @pagination_record_count
      a..b
    end

first_page?() click to toggle source

Returns true if the current page is the first page

    # File lib/sequel/extensions/pagination.rb, line 66
    def first_page?
      @current_page == 1
    end

last_page?() click to toggle source

Returns true if the current page is the last page

    # File lib/sequel/extensions/pagination.rb, line 71
    def last_page?
      @current_page == @page_count
    end

next_page() click to toggle source

Returns the next page number or nil if the current page is the last page

    # File lib/sequel/extensions/pagination.rb, line 76
    def next_page
      current_page < page_count ? (current_page + 1) : nil
    end

page_range() click to toggle source

Returns the page range

    # File lib/sequel/extensions/pagination.rb, line 81
    def page_range
      1..page_count
    end

prev_page() click to toggle source

Returns the previous page number or nil if the current page is the first

    # File lib/sequel/extensions/pagination.rb, line 86
    def prev_page
      current_page > 1 ? (current_page - 1) : nil
    end

set_pagination_info(page_no, page_size, record_count) click to toggle source

Sets the pagination info for this paginated dataset, and returns self.

    # File lib/sequel/extensions/pagination.rb, line 91
    def set_pagination_info(page_no, page_size, record_count)
      @current_page = page_no
      @page_size = page_size
      @pagination_record_count = record_count
      @page_count = (record_count / page_size.to_f).ceil
      self
    end

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