ruby on rails - Changing validation rules on-the-fly -

I need conditional verification in some parts of my app right now I am using the following plan:

  User Create User :: withPassword.create User :: WithPhone.create  

It would be nice if I could change the class behavior when I fly:

  User.with_phone.with_password.create  

So I tried to do this:

  class user & lt; ActiveRecord :: Base valid: phone, presence: true, if: phone_require? Def self.with_phone define_method (: phone_required?) {True} Need a self-def personal def phone? Incorrect end term  

Then it can be used like this where:

  user.with_phone.create (user_params)  

The problem with this approach is that all the examples of users get new behavior since the actual class changes.

Is there a way to return only the modified copy of the user class without the effect of class new instance method phone_required?

Updates

Thank you for this comment is more about an idea, the requirement is that I have users without something Automatically build assumptions, and then when they edit the profile, they are working with the old user model

Here's my next visit: < / P>

  class user & lt; ActiveRecord :: Base valid: phone, presence: true, if: phone_require? Def self.with_password define_singleton_method (: password_required?) {True} self end DEF password_required? Self.class.try: password_required? Finally  

Apparently this is not any better because the singleton system will always be there.

Why not only use an initial frequency at construction time?

  class user & lt; ActiveRecord :: Base valid: phone, presence: true, if: phone_require? @phone_required = false def self.create_with_phone (consultation) obj = self.create (params) obj.phone_required = true end personal def phone_required = (v) @phone_required = v end def phone_required? @phone_required End End User.create_with_phone (user_params)