初始化会中断rails中的布局设置吗? [英] will initialize break the layout settings in rails?

问题描述

在其中一个控制器中，我需要特定的布局.我在开始处添加了layout.效果很好.

In one of the controller, I need a specific layout. I added layout at the beginning. It works well.

但是如果我为一些基于控制器的变量添加initialize函数. Rails似乎只是忽略了layout命令.

But if I add an initialize function for some controller-based variable. Rails seems just ignore the layout command.

有人有同样的问题吗?我该如何解决?

Is anyone have same problem? How can I fix it?

class AdminsController < ApplicationController

  layout "layout_admins"

  def initialize
    @Title = "Admins"
  end

  def index
    ....... some code here
  end
end

推荐答案

initialize在Rails内部使用，以便初始化控制器的新实例，以便随后可以在其上提供请求.通过以这种特定方式定义此方法，您正在破坏Rails .

initialize is used internally to Rails to, well, initialize a new instance of your controller so it can then serve requests on it. By defining this method in this particular manner, you are breaking Rails.

有一条路要走！隧道尽头的灯.彩虹尽头的一罐金:

There is a way through! A light at the end of the tunnel. A pot of gold at the end of the rainbow:

def initialize
  @title = "Admins"
  super
end

看到那边的super小电话吗?这将调用超类的initialize方法，完全执行Rails否则会执行的操作.现在，我们已经介绍了如何 方式进行操作，下面我们来介绍如何实现官方认可的" Rails方式

See that little super call there? That'll call the superclass's initialize method, doing exactly what Rails would do otherwise. Now that we've covered how to do it your way, let's cover how to do it the "officially sanctioned" Rails way:

class AdminsController < ApplicationController
  before_filter :set_title


  # your actions go here

  private      
    def set_title
      @title = "Title"
    end
end

是的，这是更多的代码，但是它会减少凝视您的代码的其他人的挫败感.这是常规的操作方式，我强烈建议您遵循以下约定，而不是魔术".

Yes, it's a little more code but it'll result in less frustration by others who gaze upon your code. This is the conventional way of doing it and I strongly encourage following conventions rather than doing "magic".

如果您使用的是Rails 5，则需要使用before_action而不是before_filter.

If you're using Rails 5 then you'll need to use before_action instead of before_filter.

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