Question

为什么一个方法调用一个？一下子就把参数传递给它了吗？仅供参考，我更新到Mongoid 5.0

在下面的迹线中表示单例的第18行是问题。我不确定它是如何到达该行的，因为mongodb中有1个Settings对象，所以它不应该创建一个？

对象：

class Settings
  include Mongoid::Document
  field :use_kue, :type => Boolean, :default => false
  field :api_url, :type => String
  field :online_reason, :type => String

  def self.singleton
    s = Settings.first  
    if s.nil?
      s = Settings.create <---- the line causing the issue
    end
    s
  end

  def self.use_kue?
    s = Settings.singleton
    s.use_kue
  end
end

致电：

if Settings.use_kue?
 .....
end

堆栈跟踪：

Started GET "/ems/admin" for 70.124.147.246 at 2019-05-06 21:57:14 +0000 
May 06 16:57:15  app/web.1: Processing by EmController#admin as HTML 
May 06 16:57:15  app/web.1: Completed 500 Internal Server Error in 8ms 
May 06 16:57:15  app/web.1: NameError (undefined local variable or method `args' for SendGrid::Settings:Class): 
May 06 16:57:15  app/web.1:   app/models/settings.rb:18:in `singleton' 
May 06 16:57:15  app/web.1:   app/controllers/em_controller.rb:45:in `admin'

修复：

使用以下Ruby，rails或MongoID的东西不喜欢以's'命名的模型（设置代替设置起作用）。我猜1.9，Rails 4和旧的MongoID更宽容。

红宝石“ 2.4.2” gem'rails'，'〜> 4.2.8' 宝石'mongoid'，'〜> 5.0.0'

为什么未定义的局部变量或方法'args'

0 个答案: