Rails ActiveRecord: validate single attribute

ruby-on-rails validation rails-activerecord

Nikita Fedyashev · Jan 26, 2011 · Viewed 18.6k times · Source

If there is a way I can validate single attribute in Rails?

Something like:

ac_object.valid?(attribute_name)

I'm gonna use it for AJAX validation of particular model fields. Moving these validations to the Javascript makes code really ugly.

Answer

You can implement your own method in your model. Something like this

def valid_attribute?(attribute_name)
  self.valid?
  self.errors[attribute_name].blank?
end

Or add it to ActiveRecord::Base