Module: Paginate::Helpers::Shared

Included in:
Merb
Defined in:
lib/helpers/shared.rb

Overview

Shared helper methods included in other Helper modules.

Instance Method Summary collapse

Instance Method Details

#page_set(current_page, pages, padding = 3) ⇒ Object

page_set returns an Array of page numbers that can be used by a view for displaying page links. It includes the first page, the current page, with up to padding pages before and after, and the last page. If pages are skipped between any of these groups, 0 stands in for them, as an indicator to the view that, for example, elipses might be used here. For example:

page_set(3, 10, 3)
=> [1, 2, 3, 4, 5, 6, 0, 10] TODO test this in particular

The 0 at index 6 is an indication that there are skipped pages.



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# File 'lib/helpers/shared.rb', line 16

def page_set(current_page, pages, padding = 3)
  
  # Determine first and last page in group around current page
  first = [1, current_page - padding].max
  last = [pages, current_page + padding].min
  
  # Determine if an additional "First page" is needed and whether any
  # pages are skipped between it and the first around the current page
  leader = case first
    when 1 then []  # First not needed
    when 2 then [1] # First needed, but none skipped
    else [1, 0]     # First needed, some skipped
  end

  # Determine if an additional "Last page" is needed and whether any
  # pages are skipped between the last around the current page and it.
  footer = case last
    when pages then []          # Last not needed
    when pages - 1 then [pages] # Last needed, but none skipped
    else [0, pages]             # Last needed, some skipped
  end
  
  # Join Arrays together
  leader + (first..last).to_a + footer
end