为什么form_for方法将符号作为参数？

Question

我正在研究Rails博客教程，语法如下：

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

我真的不明白辅助方法或方法何时将符号作为参数，何时不是...

Answer 1

form_for接受多种类型的参数。

（a）symbol：form_for：article

mysqli_query($connessione,"INSERT INTO earthquakes  (id,idserial,milliseconds,latitude,longitude,magnitude,ipocentro,source,region) VALUES $values");

（b）string：form_for＆＃34; article＆＃34;

  form elements can accessed in controller by params[:article]

（c）object：form_for @article

  form elements can be accessed in controller by params[:article]

（d）array：form_for [：my，@ article]

  (1) Here @article is expected to contain an instance of Article. In the controller this form elements can be accessed through params[:article].

  (2) If a form is expected to be accessed through a custom name, it can be done by using :as operator. form_for @post, as: :my_post

Answer 2

需要一些其他细节来理解答案：此函数实际上将符号，字符串或路径作为可能的参数。

回答＆＃34;为什么＆＃34;的问题：默认使用符号，因为比较比直接字符串比较快。