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Ruby ActiveRecord Basics Validation Errors 2

Why won't this validate method work in code challenge?

Below is the code I wrote for the code challenge Errors 2. For some reason I get the response "remember you can use the validate method and "self.errors.add(:field_name, "error message") …

I can see why this shouldn't work. Can anyone help?

class Contact < ActiveRecord::Base

validates :last_name, presence: true

validate :last_name_not_evil

def last_name_not_evil if last_name.include?("evil") errors.add(:last_name, "is evil") end end end

contact.rb
 class Contact < ActiveRecord::Base

   validates :last_name, presence: true

   validate :last_name_not_evil

   def last_name_not_evil
     if last_name.include?("evil")
       errors.add(:last_name, "is evil")
     end
   end
 end