Ruby on Rails - 全局变量？ [英] Ruby on Rails - Global Variable?

问题描述

我是一名新的Ruby on Rails用户，并有一个问题。我知道我想让我的用户数据库看起来像什么，但想知道我是否应该为其添加额外的值。基本上我需要一个变量来向所有用户发出信号，告诉他们进行某种操作是安全的。这个变量在所有用户中都是持久的，并且应该对所有用户都可见，但是我希望服务器也能够更改这个变量。当使用其他语言进行编程时，我会使用全局变量，所以我想检查这里是否也是这种情况。如果是这样，这是否是实现它的最佳方法： Ruby on Rails中的站点范围全局变量。另外，我将如何更新全局变量。感谢您的帮助！

I am a new Ruby on Rails user and had a question. I have an idea of what I want my Users DB to look like but was wondering whether or not I should add an additional value to it. Basically I need a variable to signal to all users that it is safe to proceed with a certain action. This variable would be persistent across all users and should be visible to all users, but I want the server to be able to change this variable as well. When programming in other languages, I would use a global variables, so I wanted to check if that is also the case here. If so, would this be the best approach for going about it: Site-Wide Global Variables in Ruby on Rails. Also, how would I update the global variables. Thanks for any help!

推荐答案

全局变量不适合您的需求。它并不遍布所有的Ruby进程。如果您的Web服务器产生5个Ruby进程来同时处理5个请求，那么第一个进程中定义的变量将不会被其他进程看到。

A global variable doesn't fit your need. It doesn't spread across all the Ruby processes. If your web server spawns 5 ruby processes to handle 5 request at the same time, the variable defined in the first process won't be visible to the others.

其他解决方案。您可以使用数据库并将标志/信息存储在数据库中。否则，您可以使用文件并将该值存储在文件中。
最好的解决方案是内存共享数据源，例如memcached或Redis。

There are other solutions available. You can use a database and store the flag/information on the database. Otherwise, you can use a file and store the value in the file. The best solution would be an in-memory shared data source, such as memcached or Redis.

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