为什么form_for方法以符号为参数？

Question

我工作的Rails的博客教程和语法云：

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

我真的不明白，当一个辅助方法或方法接受一个符号作为参数，当它不...

Answer 1

form_for接受多种类型的参数。

（a）中的符号：的form_for：文章

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

（b）中的字符串：的form_for “制品”

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

（C）对象：的form_for @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 

（d）array：form_for [：my，@article]

:my is used to namespace @article. With params[:my_article] form elements can be accessed in controller 

Answer 2

需要一些额外的细节来理解答案：该函数实际上将符号，字符串或路径作为可能的参数。

回答“为什么”的问题：缺省使用符号，因为比较比直接字符串比较快。