Rails是否使用方法:: patch与_form.html.erb进行编辑？ [英] Does rails use method: :patch for editing with _form.html.erb?

问题描述

我将遵循获取的Ruby on Rails教程指南开始，并且位于 5.12使用局部变量清除视图中的重复项。据D.R.Y，我了解为什么要使用分词。约定，但是，我对new.html.erb和edit.html.erb的区别感到好奇。具体来说，在使用部分_form.html.erb文件之前，edit.html.erb文件显式调用方法：：patch

I am following along with the Ruby on Rails tutorial guide for getting started and am in section 5.12 Using partials to clean up duplication in views. I understand why partials are used per the D.R.Y. convention, however, I am curious about a difference in the new.html.erb and edit.html.erb. Specifically, prior to using the partial _form.html.erb file, the edit.html.erb file explicitly called method: :patch

<%= form_for :article, url: article_path(@article), method: :patch do |f| %>
  <% if @article.errors.any? %>
    <div id="error_explanation">
...

...现在_form.html.erb文件涵盖了新的无需显式调用 PATCH ：

... and now the _form.html.erb file covers both new & edit without explicitly calling PATCH:

<%= form_for @article do |f| %>

  <% if @article.errors.any? %>
    <div id="error_explanation">
...

是否仍在在幕后调用PATCH进行编辑？ / p>

Is PATCH still being invoked "behind the scenes" for editing?

推荐答案

正如您在本教程中提到的：

As mentioned in the tutorial you shared:

我们可以使用这种较短，更简单的form_for声明来代表其他任何形式的原因是@article是与全套RESTful路由相对应的资源，并且Rails能够推断出哪个URI和方法

The reason we can use this shorter, simpler form_for declaration to stand in for either of the other forms is that @article is a resource corresponding to a full set of RESTful routes, and Rails is able to infer which URI and method to use.

另外，来自参考给出：

对于现有的资源或记录为 @post ，它是等效于：

For an existing resource or record for @post, it is equivalent to:

<%= form_for @post, as: :post, url: post_path(@post), method: :patch, html: { class: "edit_post", id: "edit_post_45" } do |f| %>
  ...
<% end %>

其中，对于资源的新记录，即 Post.new ，它等效于

Whereas, for a new record of the resource, i.e. Post.new, it is equivalent to

<%= form_for @post, as: :post, url: posts_path, html: { class: "new_post", id: "new_post" } do |f| %>
  ...
<% end %>

因此，在这种情况下，魔力在于两件事，帮助铁轨了解该怎么做格式如下：

Thus, in this case, magic lies in the rails with 2 things, helping rails understand what to do with this form:

1. 您为模型定义的路线，资源：商品


2. 资源对象的类型（现有记录或新记录）传递给 form_for 。

1. Your defined routes for your model, resources :article
2. The type(Existing record or a new record) of resource object passed to form_for.

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