创建自定义 Rails 记录器 [英] Create a custom Rails Logger

问题描述

这已经过时了吗?http://guides.rubyonrails.org/debugging_rails_applications.html我正在一步一步地跟踪它，

在2.1 什么是 Logger?"部分?

它说明了如何创建自定义记录器.

1) 您可以在您的 environment.rb 或任何环境文件中指定替代记录器:

Rails.logger = Logger.new(STDOUT)Rails.logger = Log4r::Logger.new("应用程序日志")

我把这段代码放在我的 environment.rb 文件中，我得到了这个:

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未初始化的常量 Log4r (NameError)

..然后它说'或者在初始化部分，添加以下任何一项:'

config.logger = Logger.new(STDOUT)config.logger = Log4r::Logger.new("应用程序日志")

我的 environment.rb 文件中没有初始化程序部分！我得到了同样的错误！

它说'如果你愿意，你也可以替换另一个记录器，比如 Log4r.'为什么有人要替换现有的记录器?

我从 environment.rb 文件中删除了 Rails.logger = Log4r::Logger.new("Application Log").它似乎正在工作，但我期待在 log/目录中创建一个文件，但什么也没有.这是我的 environment.rb 文件:

#加载rails应用需要 File.expand_path('../application', __FILE__)Rails.logger = Logger.new('应用程序日志')# 初始化 Rails 应用程序MyApp::Application.initialize！

帮助?请解释一下?

解决方案

您可以通过以下方式全局设置 Rails 记录器:

Rails.logger = ...

或者您可以将其放入环境文件中，例如在 config/environments/development.rb

MyApp::Application.configure 做config.logger = ...结尾

接下来，Log4r 是一个独立的 gem，它不随 Rails 提供.如果您想使用它，请将其添加到您的 Gemfile 中:

gem "log4r", "~> 1.1.10"

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为什么有人想要替换现有的记录器?

因为记录器具有一组不同的功能.您可能希望使用自定义记录器将日志上传到外部服务，进行处理等.

Is this outdated? http://guides.rubyonrails.org/debugging_rails_applications.html I am following it step by step,

And in part '2.1 What is the Logger?'

It says how to create a custom logger.

1) You can specify an alternative logger in your environment.rb or any environment file:

Rails.logger = Logger.new(STDOUT)
Rails.logger = Log4r::Logger.new("Application Log")

I put this code in my environment.rb file and I get this:

uninitialized constant Log4r (NameError)

..then it says 'Or in the Initializer section, add any of the following:'

config.logger = Logger.new(STDOUT)
config.logger = Log4r::Logger.new("Application Log")

I dont have an initializer section in my environment.rb file! I get the same error!

It says 'You can also substitute another logger such as Log4r if you wish.' Why would somebody want to substitute an existing logger?

I removed Rails.logger = Log4r::Logger.new("Application Log") from the environment.rb file. It seems to be working, but I was expecting a file being created in the log/ directory but nothing. Here is my enviroment.rb file:

# Load the rails application
require File.expand_path('../application', __FILE__)

Rails.logger = Logger.new('Application Log')

# Initialize the rails application
MyApp::Application.initialize!

help? Some explanation please?

解决方案

You can set the Rails logger globally with:

Rails.logger = ...

or you can put it into an environment file, e.g. in config/environments/development.rb

MyApp::Application.configure do
  config.logger = ...
end

Next, Log4r is a separate gem that does not come with Rails. If you want to use it, add it to your Gemfile:

gem "log4r", "~> 1.1.10"

Why would somebody want to substitute an existing logger?

Because loggers have a different set of features. You might want to use a custom logger to upload the logs to an external service, process it etc.

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