Better paging solution for DataMapper for DM >= 0.10.1

Not to be confused with the dm-pagination gem (a similar gem lacking in functionality) dm-pager is a new, fresh, and feature rich pagination implementation for DataMapper. Due to Github's gem builder being destroyed, we were forced to rename our gem to 'dm-pager' which is now available on Gemcutter.org.

Install Gemcutter and execute: $ sudo gem install dm-pager

Page 1 for all items, defaulting to 6 per page: Item.page // => [1, 2, 3, 4, 5, 6]

Page 2 for all items, 6 per page, with only 3 items remaining Item.page 2 // => [7, 8, 9]

Page 3, 2 per page: Item.page 3, :per_page => 2 // => [5, 6]

Accessing the pager instance: Item.page(1, :per_page => 4).pager // => #<DataMapper::Pager:0x1610f20 @per_page=4, @next_page=2, @total_pages=3, @total=10, @current_page=1>

Converting to HTML: Item.page(2).pager.to_html('/items') // => "<div class="pager">..."

Alter the number of intermediate numbered links displayed, defaults to 7 Item.page(2).pager.to_html('/items', :size => 3) // => "<div class="pager">..."

Output is displayed in a format similar to below, although with CSS you may hide anything you wish to remove. There is no need to provide an API for this.

Item.page(2).pager.to_html('/items', :size => 3)
// => First Previous 1 [2] 3 ... Next Last

Item.page.pager.to_html '/items'
// => [1] 2 3 4 5 6 7 ... Next Last

Item.page(5).pager.to_html('/items', :size => 5)
// => First Previous ... 3 4 [5] 6 7 ... Next Last

Sample query: Item.page(2, :per_page => 2).pager.to_html("/items", :size => 3)

Sample markup:

<div class="pager">
  <a href="/items?page=1" class="first">First</a>
  <a href="/items?page=1" class="previous">Previous</a>
  <ul>
    <li class="page-1 first"><a href="/items?page=1" class="">1</a></li>
    <li class="active page-2"><a href="/items?page=2" class="">2</a></li>
    <li class="page-3 last"><a href="/items?page=3" class="">3</a></li>
    <li class="more">...</li>
  </ul>
  <a href="/items?page=3" class="next">Next</a>
  <a href="/items?page=5" class="last">Last</a>
</div>

Autospec: $ autospec

Rake: $ rake spec $ rake spec:verbose $ rake spec:select SPEC=spec/unit/pager_spec.rb

RSpec: $ spec --color spec

• TJ Holowaychuk tj@vision-media.ca
• Marco Otte-Witte http://simplabs.com

(The MIT License)

Copyright (c) 2009 TJ Holowaychuk tj@vision-media.ca

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, an d/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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