Rails 4 & ActiveRecord: prevents freezes if the owner exists

Question

Given the following classes:

class User < ActiveRecord::Base has_one :profile, dependent: :destroy end class Profile < ActiveRecord::Base belongs_to :user end 

How to prevent ActiveRecord from destroying the profile that the owner has? I mean, it should not be possible to destroy the profile if there is a user who owns it.

I did like this:

 class User < ActiveRecord::Base has_one :profile after_destroy :destroy_profile private def destroy_profile profile.destroy end end class Profile < ActiveRecord::Base belongs_to :user before_destroy :check_owner_user def check_owner_user unless user.nil? raise CustomException.new("Cannot delete while its owner user exists.") end end end 

It seems to me that this worked. Do Rails or ActiveRecord provide a better and more concise solution?