Module ActiveRecord::Acts::List::ClassMethods
In: lib/active_record/acts/list.rb

This act provides the capabilities for sorting and reordering a number of objects in a list. The class that has this specified needs to have a "position" column defined as an integer on the mapped database table.

Todo list example:

  class TodoList < ActiveRecord::Base
    has_many :todo_items, :order => "position"
  end

  class TodoItem < ActiveRecord::Base
    belongs_to :todo_list
    acts_as_list :scope => :todo_list
  end

  todo_list.first.move_to_bottom
  todo_list.last.move_higher

Methods

Public Instance methods

Configuration options are:

  • column - specifies the column name to use for keeping the position integer (default: position)
  • scope - restricts what is to be considered a list. Given a symbol, it’ll attach "_id" (if that hasn’t been already) and use that as the foreign key restriction. It’s also possible to give it an entire string that is interpolated if you need a tighter scope than just a foreign key. Example: acts_as_list :scope => ‘todo_list_id = #{todo_list_id} AND completed = 0’

[Validate]