Rails：缓存类忽略了mixin

Question

我已经扩展了ActiveRecord :: Base类，如下所示：

LIB / activerecord_ext.rb：

class ActiveRecord::Base
  named_scope( 
    :recent, 
    :conditions => ['created_at > ?', (Time.new - 3.day)], 
    :order => 'created_at DESC', 
    :limit => 5
  )
end

在config / environment.rb中：

require "activerecord_ext"

这样可以正常启用类缓存。当我设置

config.cache_classes = true

我收到此错误：

>> Person.recent
NoMethodError: You have a nil object when you didn't expect it!
The error occurred while evaluating nil.call
 from /Library/Ruby/Gems/1.8/gems/activerecord-2.3.3/lib/active_record/named_scope.rb:102:in `recent'
 from (irb):1

我认为我对包含扩展名做错了。任何帮助将不胜感激。

Answer 1

在require 'activerecord_ext'行之前或之后config.cache_classes = true？无论如何，请尝试将require'activerecord_ext'放在初始化程序中。