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[Rails] 分辨 symbol 和 string

遇到 Ruby 語法上，冒號 + 變數 ？

routes.rb
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resources :products do
  member do
    post :add_to_cart
  end
end

而products 就叫做 symbol

什麼是 Symbol?

翻譯上，符號象徵
可以直接說是，不可改變的字串

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