爲什麼form_for方法以符號爲參數？

Question

我工作的Rails的博客教程和語法雲：

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

我真的不明白，當一個輔助方法或方法接受一個符號作爲參數，當它不...

Answer 1

form_for接受多種類型的參數。

（a）中的符號：的form_for：文章

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

（b）中的字符串：的form_for 「製品」

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

（C）對象：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

需要一些額外的細節來理解答案：該函數實際上將符號，字符串或路徑作爲可能的參數。

回答「爲什麼」的問題：缺省使用符號，因爲比較比直接字符串比較快。