Rails：论坛 has_many 主题，保存关联吗？

发布于 2025-01-08 07:53:30 字数 681 浏览 2 评论 0原文

我可能一开始就以错误的方式来处理这个问题，所以我首先会介绍一些背景知识。

正如您从标题中可以看出的，我正在从头开始构建一个论坛。我以为它工作正常；但是，我有点不确定如何从控制器的主题“创建”方法中更新/保存论坛对象。

我尝试做的事情：在“New”方法中，我通过路由发送了论坛的 id。因此，在新主题页面上有一个如下所示的地址：“localhost:3000/new-topic/1”。其中一个是论坛的 id。在方法本身中，我尝试将其附加到新的主题对象。

@topic = Topic.new
@topic.forum = Forum.find(params[:id])

然后我的创建方法尝试使用该论坛。

@topic = Topic.new(params[:topic])
@topic.forum.topics << @topic #Simplified down.
if @topic.save
  @topic.forum.save
...

我感觉我处理这件事的方式是错误的。我正在看某人的教程，他们通过调用 params[:forum_id] 获得了论坛，但他们没有显示他们为实现这一目标所做的路由。

我如何正确地执行此操作和/或路由所有这些的正确方法是什么？作为记录，我确实计划对主题 => 使用相同的方法邮政协会。感谢您的任何帮助。

原文

I might be going about this the wrong way in the first place, so I will give a bit of background first.

As you can tell from the title, I am building a forum from scratch. I thought it was working correctly; however, I am a bit unsure as to how to update/save the forum object from within the topics "create" method in it's controller.

What I tried to do:
In the "New" method, I sent the Forum's id via the routing. So on the new-topic page has a address that looks like this: "localhost:3000/new-topic/1". The one being the Forum's id. In the method itself, I try to attach it to the new topic object.

@topic = Topic.new
@topic.forum = Forum.find(params[:id])

My create method then tries to use that forum.

@topic = Topic.new(params[:topic])
@topic.forum.topics << @topic #Simplified down.
if @topic.save
  @topic.forum.save
...

I get the feeling that I am going about this the wrong way. I was looking at someone's tutorial and they got the forum by calling params[:forum_id] but they didn't show they routing they did to achieve that.

How do I do this correctly and/or what is the correct way to route all of this? For the record, I do plan on using this same method for the Topic => Post association. Thanks for any help.

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青衫负雪 2025-01-15 07:53:30

您应该使用嵌套的 REST 路由：

# routes.rb
resources :forums do
  resources :topics
end

这将导致以下路由：

GET  /forums/:forum_id/topics/new # displays the form
POST /forums/:forum_id/topics     # creates the topic

并且在控制器中您应该使用构建器，它们具有安全性、范围保留等多个优点：

def new
  @forum = Forum.find(params[:forum_id])
  @topic = @forum.topics.build

def create
  @forum = Forum.find(params[:forum_id])
  @topic = @forum.topics.build(params[:topic])
  if @topic.save
    ...

http://api.rubyonrails.org/classes/ActionDispatch/Routing/Mapper/Resources.html#method-i-resources

You should use nested REST routes:

# routes.rb
resources :forums do
  resources :topics
end

this will result in the following routes:

GET  /forums/:forum_id/topics/new # displays the form
POST /forums/:forum_id/topics     # creates the topic

and in controller you should use builders, they have several advantages like security, scope preserving etc.:

def new
  @forum = Forum.find(params[:forum_id])
  @topic = @forum.topics.build

def create
  @forum = Forum.find(params[:forum_id])
  @topic = @forum.topics.build(params[:topic])
  if @topic.save
    ...

http://api.rubyonrails.org/classes/ActionDispatch/Routing/Mapper/Resources.html#method-i-resources

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