Module Sequel::Dataset::Pagination
In: lib/sequel/extensions/pagination.rb

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).

Methods

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

Returns the number of records in the current page

[Source]

    # File lib/sequel/extensions/pagination.rb, line 52
52:       def current_page_record_count
53:         return 0 if @current_page > @page_count
54:         
55:         a = 1 + (@current_page - 1) * @page_size
56:         b = a + @page_size - 1
57:         b = @pagination_record_count if b > @pagination_record_count
58:         b - a + 1
59:       end

Returns the record range for the current page

[Source]

    # File lib/sequel/extensions/pagination.rb, line 42
42:       def current_page_record_range
43:         return (0..0) if @current_page > @page_count
44:         
45:         a = 1 + (@current_page - 1) * @page_size
46:         b = a + @page_size - 1
47:         b = @pagination_record_count if b > @pagination_record_count
48:         a..b
49:       end

Returns true if the current page is the first page

[Source]

    # File lib/sequel/extensions/pagination.rb, line 62
62:       def first_page?
63:         @current_page == 1
64:       end

Returns true if the current page is the last page

[Source]

    # File lib/sequel/extensions/pagination.rb, line 67
67:       def last_page?
68:         @current_page == @page_count
69:       end

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

[Source]

    # File lib/sequel/extensions/pagination.rb, line 72
72:       def next_page
73:         current_page < page_count ? (current_page + 1) : nil
74:       end

Returns the page range

[Source]

    # File lib/sequel/extensions/pagination.rb, line 77
77:       def page_range
78:         1..page_count
79:       end

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

[Source]

    # File lib/sequel/extensions/pagination.rb, line 82
82:       def prev_page
83:         current_page > 1 ? (current_page - 1) : nil
84:       end

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

[Source]

    # File lib/sequel/extensions/pagination.rb, line 87
87:       def set_pagination_info(page_no, page_size, record_count)
88:         @current_page = page_no
89:         @page_size = page_size
90:         @pagination_record_count = record_count
91:         @page_count = (record_count / page_size.to_f).ceil
92:         self
93:       end

[Validate]