zammad/app/models/concerns/has_object_manager_attributes_validation.rb

# Copyright (C) 2018 Zammad Foundation, http://zammad-foundation.org/
module HasObjectManagerAttributesValidation
  extend ActiveSupport::Concern

  included do
    include ActiveModel::Validations
    validates_with ObjectManager::Attribute::Validation, on: %i[create update]
  end
end