module ActiveRecord::Acts::List::CallbackDefiner

def self.call(caller_class, add_new_at)
  caller_class.class_eval do
    before_validation :check_top_position, unless: :act_as_list_no_update?
    before_destroy :lock!
    after_destroy :decrement_positions_on_lower_items, unless: :act_as_list_no_update?
    before_update :check_scope, unless: :act_as_list_no_update?
    after_update :update_positions, unless: :act_as_list_no_update?
    after_commit :clear_scope_changed
    if add_new_at.present?
      before_create "add_to_list_#{add_new_at}".to_sym, unless: :act_as_list_no_update?
    end
  end
end