跟踪/记录 ActiveRecord 回调 [英] Tracking/Logging ActiveRecord Callbacks

问题描述

有没有办法在每次发生 ActiveRecord 回调时自动记录?当记录有多个回调时，这将有助于追溯为什么会发生某些事情.

Is there any way to automatically log everytime an ActiveRecord callback happens? It would help to trace through why certain things are happened when a record has several callbacks in place.

我想看到自动日志消息，指示正在调用哪些消息以响应哪些回调，例如:before_validation:调用 update_capitalization

I'd like to see automated log message that indicate which messages are being called in response to which callbacks, e.g.: before_validation: calling update_capitalization

推荐答案

对于 google 和后代(在 Rails 3 上):

For google and posterity (on Rails 3):

module CallbackTrace
  def self.included kls
    kls.send :alias_method_chain, :_compile_filter, :trace
  end

  def _compile_filter_with_trace filter
    generated_code = _compile_filter_without_trace(filter)
    return generated_code if filter.is_a?(Array)
    method_name = generated_code.to_s.split(%r{\(|\s}).first
    _klass = @klass
    prelogger = ->{
        Rails.logger.info("START [#{filter.class}](#{generated_code})")
        Rails.logger.info("#{_klass} #{Time.now}")
        if imethod=(_klass.instance_method(method_name) rescue nil)
          begin
            Rails.logger.info(imethod.source)
          rescue MethodSource::SourceNotFoundError
            Rails.logger.info("NO SOURCE FOR #{generated_code}")
          end
        else
          Rails.logger.info("NO METHOD: #{method_name} for #{@klass}")
        end
    }
    postlogger = ->{
      Rails.logger.info("ENDED #{generated_code} #{Time.now}")
    }
    @klass.send :define_method, "prelogger_#{method_name}", &prelogger
    @klass.send :define_method, "postlogger_#{method_name}", &postlogger
    "(prelogger_#{method_name}; retval = retval = #{generated_code}; " +
        "postlogger_#{method_name}; retval)"
  end
end
ActiveSupport::Callbacks::Callback.send :include, CallbackTrace

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