Move uniqueness and association validations to Active Record

activerecord/lib/active_record/validations.rb

@@ -65,3 +65,8 @@ def errors
     end
   end
 end
+
+Dir[File.dirname(__FILE__) + "/validations/*.rb"].sort.each do |path|
+  filename = File.basename(path)
+  require "active_record/validations/#{filename}"
+end

activemodel/lib/active_model/validations/associated.rb → activerecord/lib/active_record/validations/associated.rb

-module ActiveModel
+module ActiveRecord
   module Validations
     module ClassMethods
       # Validates whether the associated object or objects are all valid themselves. Works with any kind of association.

activemodel/lib/active_model/validations/uniqueness.rb → activerecord/lib/active_record/validations/uniqueness.rb

-module ActiveModel
+module ActiveRecord
   module Validations
     module ClassMethods
       # Validates whether the value of the specified attributes are unique across the system. Useful for making sure that only one user