[英]Can not add ActiveRecord callback by using class_eval method
I have a User model, which includes module Staff: 我有一个用户模型,其中包括模块Staff:
class User < ActiveRecord::Base
include Staff
...
end
I want to add an after_update callback to all the models that include this module: 我想向包含此模块的所有模型添加一个after_update回调:
module Staff
def self.included(model)
model.class_eval do
after_update :callback
end
end
private
def callback
...
end
end
I get a NoMethodError: 我收到一个NoMethodError:
undefined method `after_update' for Object:Class
What am I doing wrong? 我究竟做错了什么?
Solved! 解决了! The problem was that I had another class including my module Staff, which was not an ActiveRecord model.
问题是我还有另一个类,包括模块Staff,它不是ActiveRecord模型。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.