app/models/approval_extext.rb
class ApprovalExtext < ActiveRecord::Base
attr_accessible :approval_id, :created_at, :position, :updated_at, :value, :created_by, :state, :comment_at, :name
belongs_to :approval
belongs_to :create_user, :class_name => "User", :foreign_key => :created_by
acts_as_list :scope => [:approval_id, :name]
default_scope :order => "position ASC"
has_paper_trail
end