Rails 3 plugin for simple ordering.

Insert into your Gemfile:

gem "ar-orderable"

then bundle install

1. Add order field, like order_nr as integer
2. In model add line acts_as_orderable and if needed add options
   • column: "my_custom_order_field" # default it's order_nr
   • scope: :locale # to order in some scope, you can add also as array [:locale, :some_type]
3. If your table already has some rows of data then call the YourModel.order_unordered after adding new column.

Example migration:

add_column :categories, :order_nr, :integer # change to your column name
Category.order_unordered # remove this for new table
add_index :categories, :order_nr

To reorder items use the move_to(<integer>), move_up and move_down methods, for example:

item.move_to 3 # moved to 3rd position
item.move_up # moved to 2rd position
item.move_down # moved to 3d position

To skip model callbacks and just update order information you can specify :skip_callbacks => true option:

# in your model
acts_as_orderable :skip_callbacks => true

# or whenever you call one of the ordering methods
item.move_to 3, :skip_callbacks => true
item.move_up :skip_callbacks => true
item.move_down :skip_callbacks => true

rspec spec # all examples should be green

Copyright (c) 2009 IT House, released under the MIT license