将全局变量放在Rails 3中的位置

I used to put Global variables in environment.rb with my Rails 2.3.8 application such as:

我曾经使用我的Rails 2.3.8应用程序将Global变量放在environment.rb中，例如：

MAX_ALLOWD_ITEMS = 6

It doesn't seem to work in Rails 3. I tried putting it in application.rb and that didn't help.

它似乎在Rails 3中不起作用。我尝试将它放在application.rb中并且没有帮助。

What do you suggest?

你有什么建议？

5 个解决方案

#1

If you have already tried restarting your server as Ryan suggested, try putting it in your application.rb like this:

如果您已经尝试过像Ryan建议的那样重新启动服务器，请尝试将它放在您的application.rb中，如下所示：

module MyAppName
  class Application < Rails::Application
    YOUR_GLOBAL_VAR  = "test"
  end
end

Then you can call it with the namespace in your controllers, views or wherever..

然后你可以在控制器，视图或任何地方使用命名空间调用它。

MyAppName::Application::YOUR_GLOBAL_VAR

Another alternative would be using something like settingslogic. With settingslogic, you just create a yml config file and a model (Settings.rb) that points to the config file. Then you can access these settings anywhere in your rails app with:

另一种选择是使用settingslogic之类的东西。使用settingslogic，您只需创建一个yml配置文件和一个指向配置文件的模型（Settings.rb）。然后，您可以在rails应用中的任何位置访问这些设置：

Settings.my_setting

#2

I usually go with application_helper.rb This is what it looks like:

我通常使用application_helper.rb这是它的样子：

module ApplicationHelper
  def my_global_variable 
    my_global_variable = "Helloworld!"      
  end
end

Then I can put in my_global_variable anywhere as a function.

然后我可以将my_global_variable放在任何地方作为函数。

#3

If you are truly defining it in config/environment.rb like you say, the only way I can duplicate your problem is by running up a server using rails server, then putting in the variable to config/environment.rb, referencing it in a view or controller somewhere and then trying to load that specific part of my application.

如果你真的在config / environment.rb中定义它，就像你说的那样，我可以复制你的问题的唯一方法是使用rails服务器运行服务器，然后将变量放入config / environment.rb，在一个引用它视图或控制器在某处，然后尝试加载我的应用程序的特定部分。

If I stop the server and start it again and again try to access that view or controller then it works. I reckon you just haven't restarted your server.

如果我停止服务器并再次启动它并再次尝试访问该视图或控制器，那么它可以工作。我估计你还没有重新启动你的服务器。

#4

I normally create inside config/initializers/ a yaml (yml) file with all the global site settings. remember to restart the server each time you change anything.

我通常使用所有全局站点设置创建内部config / initializers / yaml（yml）文件。记得每次更改任何内容时都要重新启动服务器。

#5

I don't know if the solution of adding variables to environment.rb would in fact work in Rails3 - to be specific, if you haven't defined the variable inside a module definition like so:

我不知道向environment.rb添加变量的解决方案是否实际上可以在Rails3中工作 - 具体来说，如果你没有在模块定义中定义变量，如下所示：

module MyConfig
  Max_ints = 5
end

you won't be able to just use Max_ints, if you just include it as a bare definition. Or at least that's what I found happened when I experimented with this. I also think the suggestion to use the initializers/ folder is possibly a better solution in terms of ease of use. See Permanent variable in Rails

如果你只是将它包含在一个简单的定义中，你就无法使用Max_ints。或者至少那是我在实验时发现的事情。我还认为使用初始化器/文件夹的建议在易用性方面可能是更好的解决方案。请参阅Rails中的永久变量

#1