Saturday, April 26, 2014
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
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`, 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
UserForm.new.valid?
# => true # We wanted to see `false` here, but no validations
# are actually running because the :validate callback
# 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 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?
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