I’m writing a library that will require programmatically copying
validations from one model to another, but I’m stumped on how to pull
I have a model that is an
ActiveModel::Model with some validation:
class User < ActiveRecord::Base validates :name, presence: true end
And another model that I’d like to have the same validations:
class UserForm include ActiveModel::Model attr_accessor :name end
Now I’d like to give
UserForm the same validations as
User. Copying the validators over doesn’t work, because
ActiveModel::Validations hooks into callbacks during the validation
UserForm._validators = User._validators UserForm.new.valid? # => true # We wanted to see `false` here, but no
# are actually running because the :validate
# is empty.
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
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?