Missed extend for eager_autoload

Author: route

activerecord/lib/active_record/associations.rb

@@ -104,6 +104,7 @@ def initialize(name)
 
   # See ActiveRecord::Associations::ClassMethods for documentation.
   module Associations # :nodoc:
+    extend ActiveSupport::Autoload
     extend ActiveSupport::Concern
 
     # These classes will be loaded when associations are created.