[ActiveRecord] How to avoid touching a class more than once in a reference hierarchy

Rails
1

say there are AR classes (omitted < ActiveRecord::Base):

class Project
end

class Member
  belongs_to :project, touch:true
end

class Todolist
  belongs_to :project, touch: true
end

class Todo
  belongs_to :todolist, touch: true
  belongs_to :member, touch: true
end

When I save a Todo instance, referenced Project instance will be touched
twice.
Is there any way to avoid this?

Appreciate for help. And sorry if my English is broken.

2

On 10 January 2013 08:03, Snow H. [email protected] wrote:

belongs_to :project, touch: true
Is there any way to avoid this?
First a question, will the todolist and member that a todo belongs to
always belong to the same project? So rather than being one project
touched twice it may be two separate projects?

Colin