Ruby-on-rails Rails：立即渲染并退出
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Rails : render and exit immediately
提问by manu_v
Using the omniauth gem, I am forced to define a single route callback for succesful logins, regardless of the provider :
使用 omniauth gem，无论提供者如何，我都被迫为成功登录定义单个路由回调：
def auth_callback
auth_data = request.env['omniauth.auth']
if auth_data.has_key('something')
process_one(auth_data)
else
process_two(auth_data)
end
# No view is available here
end
def process_one
# do something then render view for process_one
return
end
def process_two
# do something then render view for process_two
return
end
How can I prevent the controller from returning to the auth_callback method and try to display the corresponding view (which does not exist) ? Treatment should be considered as complete once the process_one or process_two methods have returned.
如何防止控制器返回 auth_callback 方法并尝试显示相应的视图（不存在）？一旦 process_one 或 process_two 方法返回，处理就应被视为完成。
回答by Kelly
Why not specifically call renderin those methods?
为什么不专门调用render这些方法呢？
def process_one
# do something then render view for process_one
render :process_one and return
end
Rails should detect that you've already run it and not try to render again.
Rails 应该检测到您已经运行了它，而不是再次尝试渲染。
回答by Ngoral
If you want to return from the chain of methods, e.g.
如果你想从方法链中返回，例如
def a
...
b
...
render "smth"
end
...
def b
...
# render from some conditional from here
...
end
will cause AbstractController::DoubleRenderError, which means that you call rendertwice.
将导致AbstractController::DoubleRenderError，这意味着您调用了render两次。
You can read this articleto find out 4 ways to manage such situation.
您可以阅读这篇文章，找出管理这种情况的 4 种方法。
