`：location =＆gt;是什么...`和`head：ok`表示'respond_to'格式声明？

Question

我正在使用Ruby on Rails 3，我想知道:location => ...和head :ok语句在以下代码中的含义，它们如何工作以及我应该如何使用它们。

respond_to do |format|
    format.xml  { render :xml => @user, :status => :created, :location => @user }
end

respond_to do |format|
    format.xml  { head :ok }
end

Answer 1

1. render ... :location => @user会设置HTTP location header以通知客户端新创建的资源的位置（即其网址）

2. head :ok sets render to return an empty response (so just the header, no body) with status 200. head :ok是render nothing: true, status: :ok的简写 Here's a list of all the :status options you can use for setting the appropriate status code.