[英]How do you make an instance variable available to the application.html.erb file in Rails?
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. 我遇到一种情况,我想在Rails应用程序的所有视图中使用某个方法中的实例变量,而我想知道这样做的“导轨”方法是什么。
If I had this situation where I had this code in my subscriptions_controller.rb
: 如果遇到这种情况,我的
subscriptions_controller.rb
有以下代码:
def index
@subscriptions = current_user.subscriptions
end
What would I do to make this instance variable available to my application.html.erb
? 我该怎么做才能将该实例变量提供给我的
application.html.erb
? I tried doing this but it doesn't work: 我尝试这样做,但是不起作用:
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. @subscriptions
实例变量为nil,我不太清楚为什么。 What is the best way to do this in Rails? 在Rails中执行此操作的最佳方法是什么?
Thanks! 谢谢!
Try setting your instance variable using a before_filter
in your ApplicationController
: 尝试在
ApplicationController
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
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