Ruby-on-rails 如果 before_action 返回 false 如何执行操作
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how to execute an action if the before_action returns false
提问by zer0uno
I know that with the following code:
我知道使用以下代码：
before_action :signed_in?, only: [:new]
before_action :signed_in?, only: [:new]
the action newwill be executed if the signed_in?returns true, but instead if I want the newaction to be executed when signed_in?returns false what do I have to do? Do I have to create a new method called, for instance, not_signed_in??
new如果signed_in?返回 true，则将执行该操作，但是如果我希望new在signed_in?返回 false时执行该操作，我必须做什么？例如，我是否必须创建一个名为 的新方法not_signed_in?？
Here it is my signed_in?method
这是我的signed_in?方法
def signed_in?
!@current_user.nil?
end
回答by Marek Lipka
before_action doesn't work as you think - it doesn't prevent action to be executed if callback returns false.
I would solve your problem in a little bit different manner, for example:
before_action 不像您想的那样工作 - 如果回调返回，它不会阻止执行操作false。我会以稍微不同的方式解决您的问题，例如：
before_action :redirect_to_root, :if => :signed_in?, :only => :new
# ...
private
def redirect_to_root
redirect_to root_path
end
回答by rene paulokat
before_action :new, unless: -> { signed_in? }
alltough i think its better to redirect in the action which was called.
虽然我认为最好在被调用的动作中重定向。
def your_action_called
redirect_to :new unless signed_in?
[...code ...]
end
回答by Konstantin Plyusnin
If you want to cover all other methods withbefore_action :signed_in?
except new action, you'b better to use :exceptinstead of :only
like this:before_action :signed_in?, except: :new
如果你想用before_action :signed_in?
除了 new action来覆盖所有其他方法，你最好使用:except而不是:only
这样：before_action :signed_in?, except: :new
