Ruby-on-rails redirect_to != 返回
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redirect_to != return
提问by demas
I'm looking for some clarification regarding the behaviour of redirect_to.
我正在寻找有关redirect_to.
I have this code:
我有这个代码：
if some_condition
redirect_to(path_one)
end
redirect_to(path_two)
If some_condition == trueI get this error:
如果some_condition == true我收到此错误：
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.
在此操作中多次调用渲染和/或重定向。请注意，您只能调用渲染或重定向，并且每个操作最多只能调用一次。
It seems that the method continues to execute after the redirect_tocall. Do I need to write code like this:
redirect_to调用后似乎方法继续执行。我是否需要编写这样的代码：
if some_condition
redirect_to(path_one)
return
end
redirect_to(path_two)
回答by Eimantas
Yes, you need to return from method when doing redirect. It actually only adds appropriate headers for the response object.
是的，您需要在进行重定向时从方法返回。它实际上只为响应对象添加适当的标头。
You can write more rubyish way:
你可以写更多的rubyish方式：
if some_condition
return redirect_to(path_one)
end
redirect_to(path_two)
or other way:
或其他方式：
return redirect_to(some_condition ? path_one : path_two)
or another way:
或其他方式：
redirect_path = path_one
if some_condition
redirect_path = path_two
end
redirect_to redirect_path
回答by Vasiliy Ermolovich
From http://api.rubyonrails.org/classes/ActionController/Base.html:
从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.
如果您需要在某些条件下重定向，请务必添加“并返回”以停止执行。
def do_something
redirect_to(:action => "elsewhere") and return if monkeys.nil?
render :action => "overthere" # won't be called if monkeys is nil
end
回答by Rimian
You can also do
你也可以这样做
redirect_to path_one and return
which reads nice.
读起来不错。
回答by Artur Beljajev
It's worth noting there is noneed to returnunless you have any code after redirect_to, as in this example:
值得注意的是，除非在 之后有任何代码，否则没有必要，如本例所示：returnredirect_to
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
回答by Jon Schneider
To consolidate the "rubyish way" example in Eimantas' answerto two lines of code:
为了巩固 Eimantas对两行代码的回答中的“rubyish 方式”示例：
return redirect_to(path_one) if some_condition
redirect_to(path_two)
回答by webaholik
If you'd like to define the redirect within a method or helper function and early return in your controller:
如果您想在方法或辅助函数中定义重定向并在控制器中提前返回：
ActionController::Metal#performed?- Tests if render or redirect has already happened:
ActionController::Metal#performed？- 测试渲染或重定向是否已经发生：
def some_condition_checker
redirect_to(path_one) if some_condition
end
Call it like this:
像这样调用它：
some_condition_checker; return if performed?
redirect_to(path_two)
