如何使用 Rufus Scheduler 在 Rails 4 外部模型中包含 Logger

Question

我有 RoR 4 API。我在我的应用程序中的任何地方都使用 Logger，例如 logger.debug "..." 没有问题，我不需要包含 Logger class.

但是我有一个从任务调度程序 Rufus Scheduler（例如 cron）调用的模型。我想在这里使用 Logger，但是出现错误。我猜是因为它不包括在内。

拜托，找到我的 class:

project_root = File.dirname(File.absolute_path(__FILE__))
Dir.glob(project_root + '/events/*') {|file| require file}

class Secretary

 def self.executeEvents

   logger.debug "Secretary.executeEvents-->Executing events..."

   # and so on...

和错误：

=== puma startup: 2015-07-10 11:04:34 +0200 ===
{ 70104498803280 rufus-scheduler intercepted an error:
  70104498803280   job:
  70104498803280     Rufus::Scheduler::EveryJob "60s" {}
  70104498803280   error:
  70104498803280     70104498803280
  70104498803280     NameError
  70104498803280     undefined local variable or method `logger' for Secretary:Class
  70104498803280       /Users/Rober/Projects/yanpy/dev/yanpyapi/app/models/secretary.rb:8:in `executeEvents'
  70104498803280       /Users/Rober/Projects/yanpy/dev/yanpyapi/config/initializers/task_scheduler.rb:9:in `block in <top (required)>'
  70104498803280       /Users/Rober/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rufus-scheduler-3.0.3/lib/rufus/scheduler/jobs.rb:224:in `call'
  70104498803280       /Users/Rober/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rufus-scheduler-3.0.3/lib/rufus/scheduler/jobs.rb:224:in `do_trigger'
  70104498803280       /Users/Rober/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rufus-scheduler-3.0.3/lib/rufus/scheduler/jobs.rb:269:in `block (3 levels) in start_work_thread'
  70104498803280       /Users/Rober/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rufus-scheduler-3.0.3/lib/rufus/scheduler/jobs.rb:272:in `call'
  70104498803280       /Users/Rober/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rufus-scheduler-3.0.3/lib/rufus/scheduler/jobs.rb:272:in `block (2 levels) in start_work_thread'
  70104498803280       /Users/Rober/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rufus-scheduler-3.0.3/lib/rufus/scheduler/jobs.rb:258:in `loop'
  70104498803280       /Users/Rober/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/rufus-scheduler-3.0.3/lib/rufus/scheduler/jobs.rb:258:in `block in start_work_thread'

Answer 1

您需要先定义您的记录器。

def self.executeEvents
   logger = Logger.new(Rails.root.join("log", "development.log"))

   logger.debug "Secretary.executeEvents-->Executing events..."

   # and so on...
end

Answer 2

原因是你不是 inheriting/including Rails class 中的任何一个（比如 ActiveRecord::Base）。这并不意味着你不可以访问全局项目变量

class MyKlass

   def call
     logger.info 'bla bla'
   end

   def logger
     Rails.logger
   end
end

MyKlass.new.call

更新1：

...顺便说一句，只有当 Rails 环境/应用程序环境加载到 class 上下文中（比如在 Rake 或其他东西中）时，这才会起作用。如果不是（例如，这是项目外的独立 class），则需要执行 def logger; @logger ||= Logger.new('path/to/log'); end

更新2：

更好的方法是将其粘贴到一个模块中，并在类似的 class 未显式继承 Rails 记录器方法

的系统中将其作为通用接口重用

module RailsLoggerInterface
  def logger
    Rails.logger
  end
end

class MyKlass
  include RailsLoggerInterface

  def call
    logger.info 'bla bla'
  end
end

class OtherKlass
  include RailsLoggerInterface

  def initialize(*args)
    logger.debug("You've initialized with #{args}")
    # ...
  end

  # ...
end

更新 3

现在我意识到你在 class 方法的上下文中需要这个，所以如果你使用模块解决方案（更新 2 中提到）你可以

class Secretary
  extend RailsLoggerInterface

  def self.executeEvents

   logger.debug "Secretary.executeEvents-->Executing events..."
  end
end

如何使用 Rufus Scheduler 在 Rails 4 外部模型中包含 Logger

How to include Logger in Rails 4 external model with Rufus Scheduler

logging

ruby-on-rails

rufus-scheduler