ruby - Rails put validation in a module mixin?

Question

Some validations are repetitive in my models:

validates :name, :length => { :minimum => 2 }, :presence => true, :uniqueness => true
validates :name_seo, :length => { :minimum => 2 }, :presence => true, :uniqueness => true

How would I put that in a mixin? I get this error if I just put 'em in a mixin

app/models/validations.rb:5: undefined method `validates' for Validations:Module (NoMethodError)

Answer 1

module Validations
  extend ActiveSupport::Concern

  included do
    validates :name, :length => { :minimum => 2 }, :presence => true, :uniqueness => true
    validates :name_seo, :length => { :minimum => 2 }, :presence => true, :uniqueness => true
  end
end

The validates macro must be evaluated in the context of the includer, not of the module (like you probably were doing).