在 Rails 中的同一操作中响应和重定向 [英] Respond_to and redirect in the same action in Rails

问题描述

在 Rails 控制器的更新操作中，通常有如下代码:

In the Update action of Rails controllers usually there is code that looks like this:

def update
  @book = Book.find(params[:id])
  if @book.update_attributes(params[:book])
    redirect_to(@book)
  else
    render :edit
  end
end

在其他情况下，这将呈现编辑模板.但是，如果我想使用 response_to 怎么办，与我在编辑操作中的方式完全相同，如:

In the else case, this will render the edit template. But what if I wanted to use a respond_to, exactly the same way that I have in the edit action, as:

def update
  @book = Book.find(params[:id])
  if @book.update_attributes(params[:book])
    redirect_to(@book)
  else
    respond_to do |format|
      format.html  # edit.html.erb
      format.json  { render :json => @team }
    end
  end
end

因此，如果更新失败，请确保根据请求的格式返回 json 或 html.这有意义吗?如果是这样，您将如何避免错误:在此操作中多次调用渲染和/或重定向"

So, if the Update fails, be sure you are returning a json or html depending on the requested format. Does that makes sense? If so, how would you avoid the error: "Render and/or redirect were called multiple times in this action"

推荐答案

对我来说很有意义.答案应该很简单，只需在 redirect_to 之后 return.

Makes sense to me. The answer should be simple, just return after redirect_to.

def update
  @book = Book.find(params[:id])
  if @book.update_attributes(params[:book])
    redirect_to(@book)
    return
  else
    respond_to do |format|
      format.html  # edit.html.erb
      format.json  { render :json => @team }
    end
  end
end

不确定你是如何多次渲染的，但假设你是这样，一个位置良好的 return 应该告诉 RAILS 在重定向后停止处理任何进一步的渲染.如果这一切都是真的，很可能是 after_filter 从某处干扰了.

Not sure exactly how you're rendering multiple times, but assuming you are, a well-placed return should tell RAILS to stop processing any further renders after redirecting. If that's all true, it's likely that there's an after_filter interfering from somewhere.

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