如何进行渲染 :edit 调用在地址栏中显示/edit [英] How to make a render :edit call show the /edit in the address bar

问题描述

在我的 Rails 应用程序中我的首选项控制器的更新操作中，如果验证/保存等中有任何错误，则会调用:

In the update action of my preferences controller in my Rails app, if there are any errors in the validation/save etc there's a call to:

<代码>format.html { 渲染:编辑}

没有什么特别的 - 但是，当点击此代码时，浏览器中的地址会发生变化并丢失 URL 中的/edit.

Nothing too unusual there - however, when this code is hit, the address in the browser changes and loses the /edit in the URL.

例如:

首先，我的浏览器显示我在以下地址的页面上:http://localhost:3000/preferences/1/edit

To start with, my browser shows I am on the page at following address: http://localhost:3000/preferences/1/edit

但是，一旦检测到错误并调用渲染器，其中的地址就会更改为 http://本地主机:3000/preferences/1

However, once the errors are detected and the render is called the address in the is changed to http://localhost:3000/preferences/1

我不能说我以前曾经注意到这种行为 - 但是有没有办法强制/edit 留在 URL 的末尾?没有/edit 它有效地显示了显示页面的 URL(我没有模板！)

I can't say I've ever noticed this behaviour before - but Is there a way to force the /edit to stay on the end of the URL? Without the /edit it is effectively showing the URL of the show page (and I don't have a template for that!)

非常感谢，灰

推荐答案

你可以redirect_to编辑页面，而不是调用render，并使用flash 跟踪模型:

Instead of calling render, you can redirect_to the edit page, and use flash to keep track of the model:

def update
  # ...
  if !@model.save # there was an error!
    flash[:model] = @model
    redirect_to :action => :edit
  end
end

然后在 edit 操作中，您可以从 flash[:model] 重新加载值，即:

And then in the edit action you can reload the values from flash[:model], ie:

def edit
  if flash[:model]
    @model = flash[:model]
  else
    @model = ... # load model normally
  end
end

更新:

正如下面评论的那样，我认为当我写这个答案时，我试图提供一种方法来更新 URL(需要重定向)并保留模型的更改属性，这就是模型存储在闪存中的原因.然而，将模型粘贴到闪存中是一个非常糟糕的主意(在 Rails 的更高版本中，它无论如何都会被反序列化)，并且 RESTful 路由并不真正需要使 URL 包含 edit.

通常的模式是仅使用内存中已有的模型渲染编辑操作，而放弃拥有理想"网址:

The usual pattern would be to just render the edit action with the model already in memory, and forego having the "ideal" URL:

def update
  # Assign attributes to the model from form params
  if @model.save
    redirect_to action: :index
  else
    render :edit
  end
end

或者，如果最好使用理想"URL 并且您不关心维护验证失败的已更改属性，请参阅@jamesmarkcook 的回答.

Alternately, if it's preferable to have the "ideal" URL and you don't care about maintaining changed attributes that failed validation, see @jamesmarkcook's answer.

这篇关于如何进行渲染 :edit 调用在地址栏中显示/edit的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！