redirect_to！= return

Question

我只想給出有關redirect_to行爲的確認。

我有代碼看起來像：

if some_condition 
    redirect_to(path_one) 
end 

redirect_to(path_two) 

如果some_condition =真正的我得到錯誤：

Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action.

看來這個方法繼續redirect_to的調用後執行。我是否需要創建如下代碼：

if some_condition 
    redirect_to(path_one) 
    return 
end 

redirect_to(path_two) 

？

Answer 1

是的，你需要做的重定向時從方法返回。它實際上只爲響應對象添加適當的標頭。

你可以寫更多rubyish方式：

if some_condition 
    return redirect_to(path_one) 
end 

redirect_to(path_two) 

或其他方式：

return redirect_to(some_condition ? path_one : path_two) 

或另一種方式：

redirect_path = path_one 

if some_condition 
    redirect_path = path_two 
end 

redirect_to redirect_path 

Answer 2

從http://api.rubyonrails.org/classes/ActionController/Base.html：

If you need to redirect on the condition of something, then be sure to add 「and return」 to halt execution.

def do_something 
    redirect_to(:action => "elsewhere") and return if monkeys.nil? 
    render :action => "overthere" # won't be called if monkeys is nil 
end 

Answer 3

你也可以做

redirect_to path_one and return 

這很好看。

Answer 4

值得一提的還有沒有需要return除非你redirect_to後有任何代碼，如下例所示：

def show 
    if can?(:show, :poll) 
    redirect_to registrar_poll_url and return 
    elsif can?(:show, Invoice) 
    redirect_to registrar_invoices_url and return 
    end 
end 

Answer 5

鞏固Eimantas' answer兩行代碼的「rubyish方式」的例子：

return redirect_to(path_one) if some_condition 

redirect_to(path_two)