I’m writing a library that will require programmatically copying validations from one model to another, but I’m stumped on how to pull this off.
I have a model that is an
ActiveModel::Model with some validation:
class User < ActiveRecord::Base
validates :name, presence: true
And another model that I’d like to have the same validations:
Now I’d like to give
UserForm the same validations as
User, and without modifying
User. Copying the validators over doesn’t work, because
ActiveModel::Validations hooks into callbacks during the validation check:
UserForm._validators = User._validators
=> true # We wanted to see
false here, but no validations
are actually running because the :validate callback
Unfortunately, there doesn’t seem to be an easy way that I can see to programmatically give one model another’s validation callbacks and still have it work. I think my best bet is if I can ask Rails to regenerate the validation callbacks based on the validators that are present at a given moment in time.
Is that possible? If not, is there a better way to do this?