如何使application.html可以使用实例变量。在Rails erb文件吗?

I have a situation where I want to use an instance variable from a method in all views in a Rails application and I was wondering what is the 'Rails' way to do this.

我有这样一种情况，我想在Rails应用程序的所有视图中使用来自方法的实例变量，我想知道实现这一点的“Rails”方法是什么。

If I had this situation where I had this code in my subscriptions_controller.rb:

如果我有这样的情况我的subscriptions_controller.rb中有这段代码:

def index
    @subscriptions = current_user.subscriptions
end

What would I do to make this instance variable available to my application.html.erb? I tried doing this but it doesn't work:

要让这个实例变量对我的application.html.erb可用，我该怎么做呢?我试过这么做，但没用:

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception

  def index
    @subscriptions = current_user.subscriptions
  end
end

The @subscriptions instance variable is nil, and I'm not too sure why. What is the best way to do this in Rails?

@订阅实例变量为nil，我不太确定原因。在Rails中，最好的方法是什么?

Thanks!

谢谢!

1 个解决方案

#1

Try setting your instance variable using a before_filter in your ApplicationController:

尝试在应用程序控制器中使用before_filter设置实例变量:

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception

  before_filter :set_subscriptions

  def set_subscriptions
    return if current_user.nil?
    @subscriptions ||= current_user.subscriptions
  end
end