Ruby on Rails:将符号作为form_for中的参数 [英] Ruby on Rails : symbol as argument in form_for

问题描述

我了解执行类似操作时传递给form_for方法的内容:

I understand what is passed to the form_for method when doing something like :

<% form_for(@user) do |f| %> ... <% end %>

如果在控制器中设置了@user.这很明显.

if @user is set in the controller. This is pretty obvious.

但是，正如我在许多示例中看​​到的那样，当我们通过:user时会发生什么?

But what happens when we pass :user, as I have seen in many examples ?

<% form_for(:user) do |f| %> ... <% end %>

何时应使用符号版本?

推荐答案

使用该符号将生成:

<form action="/users" method="post">

使用将@user设置为new的对象，您将得到:

Using the object @user set to new you get:

<form action="/users/create" class="new_user" id="new_user" method="post">

如果将@user设置为其他名称，则它将更改生成的form标记 ...亲自尝试一下.

If you set @user to something else it will change the form tag generated, of course ... try it out for yourself.

最后，这完全取决于您要执行的操作.如果在同一页面上有多个:user表单，则可能要使用该符号.

In the end it all depends what you're trying to do. You might want to use the symbol if you have multiple :user forms on the same page.

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