Rails:渲染方法中的位置选项是什么

问题描述

嘿，我想知道 rails 中渲染方法的位置选项是什么.此处的文档 http://guides.rubyonrails.org/layouts_and_rendering.html 指出:

Hey I am wondering what the location option for the render method in rails is. The docs here http://guides.rubyonrails.org/layouts_and_rendering.html states:

您可以使用 :location 选项来设置 HTTP 位置标头:"

"You can use the :location option to set the HTTP Location header:"

但我不知道你为什么要这样做，或者你会用它做什么.

But I have no idea why you would do this, or what you would use this for.

推荐答案

实际上 location 选项用于重定向到新资源，作为处理请求的一部分.例如，

Actually location option is used to redirect to a new resource as part of processing the request. For example,

 render :xml => post.to_xml, :status => :created, :location => post_url(post)

告诉接收者该帖子的 XML 文件已创建，您将从 post_url(post) 获取此文件.因此去那里;)

is telling the recipient that a XML file for the post is created and you will get this from post_url(post). Hence GO THERE ;)

render 方法通过在响应对象中设置 Location 选项来实现这一点

render method does this by setting the Location option in response object

... ... ...
if location = options[:location]
    response.headers["Location"] = url_for(location)
end
... ... ...

您可以在此处http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30.

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