升级到Rails 3.0.10后，如果设置config.cache_classes = true，我会收到奇怪的错误
NoMethodError (undefined method increment_counter' for ActiveRecord::Relation:Class):
activerecord (3.0.10) lib/active_record/associations.rb:1553:inbelongs_to_counter_cache_after_create_for_form'
activesupport (3.0.10) lib/active_support/callbacks.rb:424:in _run_create_callbacks'
activerecord (3.0.10) lib/active_record/callbacks.rb:277:increate'
activerecord (3.0.10) lib/active_record/persistence.rb:257:in create_or_update'
activerecord (3.0.10) lib/active_record/callbacks.rb:273:increate_or_update'
activesupport (3.0.10) lib/active_support/callbacks.rb:444:in _run_save_callbacks'
activerecord (3.0.10) lib/active_record/callbacks.rb:273:increate_or_update'
activerecord (3.0.10) lib/active_record/persistence.rb:60:in save!'
activerecord (3.0.10) lib/active_record/validations.rb:49:insave!'
activerecord (3.0.10) lib/active_record/attribute_methods/dirty.rb:30:in `save!'
...
我正在保存与计数器缓存具有belongs_to关系的答案模型：
increment_counter' for ActiveRecord::Relation:Class):
activerecord (3.0.10) lib/active_record/associations.rb:1553:in最奇怪的是，在服务器重新启动后，第一次保存工作正常，之后我开始得到这样的异常。
也许有人可以建议我可以从哪里开始寻找原因？
答案 0 :(得分：1)
问题是由过时的acts_as_taggable_on_steroids gem导致的，这导致了Rails3的类缓存问题。切换到可以标记为宝石的行为 - 解决了问题。