Rails，Devise，Validatable无法正常工作？(Rails, Devise, Validatable not working?)

 我有Devise设置：在我的简单应用程序上有效，但我似乎无法获得注册注册表单，如果它发现错误就停止。 
 
 User.rb： 
 
class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
...
end
 
 截至目前，我有一个标准名称/电子邮件/密码/年龄字段的注册表单，当我提交没有失败的表单时，一切正常。 
 
 但是，如果我尝试创建一个我知道会失败的新用户（例如，创建一个已经存在电子邮件的用户），它仍然会尝试创建用户，而不是重定向回到注册表单，它将继续加载下一页，就好像它是一个有效的用户！ 当然，在这一点上，我收到一个错误，因为它试图加载一个包含'current_user'代码的页面，并且用户不存在。 
 
 我甚至在哪里开始追踪这个？ 不确定这是我安装Devise的方式，还是其他什么？ 请帮忙。 谢谢！ 

I have Devise set up with :validatable on my simple app, but I can't seem to get the registration sign-up form to stop if it caught an error.
 
User.rb:
 
class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
...
end
 
As of now, I have a sign-up form with standard name/email/password/age fields, and everything works fine when I submit the form that doesn't fail.
 
But, if I try to create a new user that I know would fail (ex. create a user with an e-mail that already exists), it will still try to create the user, and instead of redirecting back to the sign-up form, it will continue to load the next page as if it was a valid user! Of course, at this point, I get an error because it tries to load up a page with 'current_user' code, and the user doesn't exist.
 
Where do I even begin to track this down? Not sure if it's the way I installed Devise, or something else?? Please help. Thanks!

原文：https://stackoverflow.com/questions/36024297