跟踪/记录ActiveRecord回调

Question

每次发生ActiveRecord回调时,有没有办法自动记录？当记录有几个回调时,这将有助于追踪为什么某些事情发生了.

我希望看到自动日志消息,指示响应哪些回调调用哪些消息,例如: before_validation: calling update_capitalization

Answer 1

对于谷歌和后代（在 Rails 3 上）：

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

Answer 2

我只是为此写了一颗宝石。

# Gemfile
gem "rails-callback_log", group: [:development, :test]

• https://github.com/jaredbeck/rails-callback_log
• https://rubygems.org/gems/rails-callback_log