使用“@user”传递使用“用户”在“html.erb”中文件：如何以及为什么？
我正在使用 Ruby on Rails 3，有人建议我 （@user 是一个全局变量，您无法“本地化”它。我建议以相同的方式从控制器传递局部变量。）使用像 user 这样的变量code> 而不是视图文件中的 @user。 到底为什么要这么做？。
因此，我正在考虑从使用 @user 改为使用 user。也就是说，（在 html.erb 文件中）从 using
@user.name
到 using
user.name
此时，例如，在我的控制器的 show 方法中，我有：
def show
@user = Users.find(1)
...
end
我必须在控制器中更改什么这在视图中有效吗？
I am using Ruby on Rails 3 and I was advised (@user is a global variable, you can't 'localize' it. I would suggest passing local variables from your controller in the same way.) to use variables like user instead of @user in view files. Why to do that, exactly?.
So, I am considering pass from using @user to using user. That is, (in html.erb file) from using
@user.name
to using
user.name
At this time, for example, in the show method of my controller I have:
def show
@user = Users.find(1)
...
end
What I have to change in the controller to do that works in views?
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只有当从多个控制器在视图中调用相同的部分时，您才需要担心这一点。
拥有使用@user的部分（可能在users_controller中设置），意味着当您从其他未设置@users的控制器（例如accounts_controller）的视图中调用该部分时，您将收到错误。如果您在部分中仅引用局部变量，则可以根据需要从任何控制器使用所描述的 :locals 哈希设置它们。
This is only something you need to worry about when the same partial is called in the views from more than one controller.
Having a partial that is using @user in it (likely set in a users_controller), means that the moment you call that partial in a view from some other controller (for example; accounts_controller) that does not set @users you will get an error. If you reference only local variables in your partial you can set them as needed from any controller with the :locals hash that was described.
这是没有意义的，只有instance_variables从控制器发送到视图。
Nikita Rybak 的回答并没有错，他只是将视图中包含的实例变量 (
@current_user) 传递给具有不同名称的部分 (user)：他总结得很好：
实际上，在使用部分时，您有两种选择：
假设它可以访问实例变量（不建议这样做）
pass将实例变量传递给具有本地名称（Rails 方式）的部分
That's non sense, only instance_variables are sent from the controller to the view.
Nikita Rybak was not wrong in his answer, he just passed the instance variable contained in his view (
@current_user) to a partial where it has a different name (user):he concluded very well:
Indeed you have two choices when working with a partial:
assume it has access to the instance variable (which is not advised)
pass the instance variable to the partial with a local name which is the Rails' way
看看这个 Rails 最佳实践。渲染局部视图（以
_开头的视图文件）时，使用局部变量是更好的方法。这是因为您需要检查控制器的代码以了解实例变量。Take a look at this Rails Best Practice. Using local variables is preferable way when rendering partials (those view files which start with a
_). That's because you'll need review your controller's code to know about instance variable.