rails logger 和 session, cookies, request方面的笔记

View Helpers for Debugging

3种方式：

debug，to_yaml，inspect

示例：

<%= debug @post %>
  Title:  <%= @post.title %>

<%= simple_format @post.to_yaml %>
  Title:  <%= @post.title %>

<%= [1, 2, 3, 4, 5].inspect %>
  Title:  <%= @post.title %>

用tagged给日志内容加前缀：

举例

logger = ActiveSupport::TaggedLogging.new(Logger.new(STDOUT))logger.tagged("BCX") { logger.info "Stuff" }                            # Logs "[BCX] Stuff"logger.tagged("BCX", "Jason") { logger.info "Stuff" }                   # Logs "[BCX] [Jason] Stuff"logger.tagged("BCX") { logger.tagged("Jason") { logger.info "Stuff" } } # Logs "[BCX] [Jason] Stuff"

当然，我们也可以使用 debugger 这个gem

gem install debugger

具体用法，在此不做过多赘述。

给不同日志指定不同的"日志文件"

new_logger = Logger.new('log/exceptions.log')new_logger.info('THIS IS A NEW EXCEPTION!')

Rails.logger和config.log以及Logger它们之间有何联系？

Rails makes use of the ActiveSupport::Logger class to write log information. You can also substitute another logger such as Log4r if you wish.

Rails.logger = Logger.new(STDOUT)Rails.logger = Log4r::Logger.new("Application Log")# 也可以，这么做config.logger = Logger.new(STDOUT)config.logger = Log4r::Logger.new("Application Log")

How can I get the current session id in rails 3? request.session_options[:id]