ActsAsPreviousNext

Description

This acts_as extension provides the capability for having previous & next methods for an object. Previous & next are based on a specified column (default is id).

Install

Rails >= 3

In your Gemfile

gem 'acts_as_previous_next'

Currently is tested on ruby 1.9.3 & 2.0.0 and mysql

Example

  class Post < ActiveRecord::Base
    acts_as_previous_next
    # acts_as_previous_next column: :id
    # or
    # acts_as_previous_next :id
  end

  post = Post.new
  post.next # => nil
  post.save
  post.next # => post
  post.previous # => post
  another_post = Post.new
  another_post.save
  another_post.next # => post
  another_post.previous # => post

Authorization support

Currently CanCan authorization is supported as option (false by default). If cancan authorization is enabled then current_ability must be passed to previous next methods. So the previous example with cancan:

  class Post < ActiveRecord::Base
    acts_as_previous_next with_cancan: true

    belongs_to :user
  end

And in your view:

  link_to 'Next', @post.next(current_ability)
  link_to 'Previous', @post.previous(current_ability)

License