如何将变量传递到布局? [英] How to pass a variable to a layout?

问题描述

我有两个版本的应用程序布局，仅在几行中有所不同.考虑以下示例:

I have a two versions of my application layout, which are differs only in a few lines. Consider following example:

!!!    
%html
    %head
        # a lot of code here
%body
    # some more code here
    - if defined? flag and flag == true
        # variant 1
    - else
        # variant 2

问题是，如何将这个标志传递给布局?

The question is, how do I pass this flag to the layout?

class ApplicationController < ActionController::Base
    layout 'layout', :locals => {:flag => true} #won't work :(

    # ...
end

推荐答案

控制器实例变量?这是将信息获取到模板的正常方法.

A controller instance variable? That's the normal way to get information to the template.

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