关系随机引发ActiveRecord :: RecordNotFound(Relation randomly raises ActiveRecord::RecordNotFound)

 偶尔尝试获取特定用户的订单记录时，会引发ActiveRecord::RecordNotFound 。 
 
 这里要注意一些事情。 
 
 
 
 访问/orders/:id时会引发错误，但不是所有用户都会引发错误。 我们跟踪已完成的订单（意味着您最终在订单页面上），大约50％获得404.请注意，我们谈论的是50％的用户，而不是请求。 如果它为特定用户的订单显示404一次，则它将始终显示404。 
 
 
 记录存在，因为可以使用控制器中记录的相同数据通过控制台访问该记录。 
 
 
 重新部署应用程序时问题消失。 
 
 
 问题是什么？ 
 
 我正在运行rails 4.2.0。 
 
class OrdersController < ApplicationController
  #
  # GET /orders/:id
  #
  def show
    Rails.logger.info "current_user=#{current_user.id}, params[:id]=#{params[:id]}"
    @order = current_user.orders.find(params[:id])
  end
end


class ApplicationController < ActionController::Base
  def current_user
    @_current_user ||= User.find_by_id(cookies.signed[:uid])
  end
end

class User < ActiveRecord::Base
  has_many :subscriptions
  has_many :orders, through: :subscriptions
end

class Order < ActiveRecord::Base
  has_one :user, through: :subscription
end

class Subscription < ActiveRecord::Base
  belongs_to :user
end
 
 这是日志输出 
 
[User#id=2454266]   Parameters: {"id"=>"1553"}
[User#id=2454266] current_user=2454266, params[:id]=1553 <==== Rails.logger.info
[User#id=2454266] Completed 404 Not Found in 240ms
[User#id=2454266]
ActiveRecord::RecordNotFound (Couldn't find Order with 'id'=1553):
  app/controllers/orders_controller.rb:6:in `show'
 
 在控制台中运行User.find(2454266).orders.find(1553) 。 
 
 另请注意，可以跳过关系并直接转到订单模型，就像这样 
 
class OrdersController < ApplicationController
  #
  # GET /orders/:id
  #
  def show
    @order = Order.find(params[:id])
  end
end

Once in a while when trying to fetch an order record for a particular user, a ActiveRecord::RecordNotFound is raised.
 
Some things to note here.
 
 
 
The error is raised when visiting /orders/:id, but not for all users. We track completed orders (meaning that you end up on a orders page) and around 50% gets a 404. Note that we're talking about 50% of the users, not the requests. If it displays 404 once for an order for a particular user, it will always display a 404.
 
 
The record exists as it can be accessed via the console using the same data that's being logged in the controller.
 
 
The problem disappears when re-deploying the application.
 
 
What could the problem be?
 
I'm running rails 4.2.0.
 
class OrdersController < ApplicationController
  #
  # GET /orders/:id
  #
  def show
    Rails.logger.info "current_user=#{current_user.id}, params[:id]=#{params[:id]}"
    @order = current_user.orders.find(params[:id])
  end
end


class ApplicationController < ActionController::Base
  def current_user
    @_current_user ||= User.find_by_id(cookies.signed[:uid])
  end
end

class User < ActiveRecord::Base
  has_many :subscriptions
  has_many :orders, through: :subscriptions
end

class Order < ActiveRecord::Base
  has_one :user, through: :subscription
end

class Subscription < ActiveRecord::Base
  belongs_to :user
end
 
Here's the log output
 
[User#id=2454266]   Parameters: {"id"=>"1553"}
[User#id=2454266] current_user=2454266, params[:id]=1553 <==== Rails.logger.info
[User#id=2454266] Completed 404 Not Found in 240ms
[User#id=2454266]
ActiveRecord::RecordNotFound (Couldn't find Order with 'id'=1553):
  app/controllers/orders_controller.rb:6:in `show'
 
Running User.find(2454266).orders.find(1553) in the console works.
 
Also note that it's possible to skip the relation and go directly to the order model, like this
 
class OrdersController < ApplicationController
  #
  # GET /orders/:id
  #
  def show
    @order = Order.find(params[:id])
  end
end

原文：https://stackoverflow.com/questions/32719359