Rails 表名字符串轉換成表的實體對象

查詢拿到一個表名，本以爲可以直接使用，發現是報錯的：

NoMethodError: undefined method `all' for "Organization":String

然後發現取到的表名是String，於是查詢變成了 "Organization".all

經過查詢發現這樣是可以的

"Organization".constantize.all

一個文檔裏面這麼寫：
https://api.rubyonrails.org/classes/String.html#method-i-constantize

• constantize tries to find a declared constant with the name
  specified in the string. It raises a NameError when the name is not
  in CamelCase or is not initialized. See
  ActiveSupport::Inflector#constantize