ruby-on-rails - Rails 设计用户存在于空数据库中

Question

我正在尝试通过 Devise 创建一个用户，但遇到了问题。
home#land

def land
  @resource = User.new
  @devise_mapping = Devise.mappings[:user]
end

land.html.haml

= form_for @resource, :as => :user, :url => registration_path(:user), :remote => true do
  = label_tag 'user[email]', raw("<h3>Stay Informed!</h3>")
  = text_field_tag 'user[email]', nil, {:placeholder => "Your email", :required => true}
  %input(type="submit" name="commit" value="Add")

user.rb

class User < ActiveRecord::Base
  before_validation(:on => :create) do
    self.password = "none"
    self.password_confirmation = "none"
  end
  # Include default devise modules. Others available are:
  # :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me
end

正在使用默认设计::RegistrationsController。

这出现在提交时:
development.log

Started POST "/users" for 127.0.0.1 at 2013-04-24 20:49:46 -0300
Processing by Devise::RegistrationsController#create as JS
  Parameters: {"utf8"=>"✓", "user"=>{"email"=>"me@mjohnst.com"}, "commit"=>"Add"}
  [1m[35m (0.3ms)[0m  BEGIN
  [1m[36mUser Exists (0.5ms)[0m  [1mSELECT 1 AS one FROM "users" WHERE "users"."email" = 'me@mjohnst.com' LIMIT 1[0m
  [1m[35m (0.2ms)[0m  ROLLBACK
  Rendered devise/registrations/create.js (0.4ms)
Completed 200 OK in 84ms (Views: 4.1ms | ActiveRecord: 1.0ms)

然而，在 rails console :

2.0.0p0 :011 > User.all
  User Load (0.5ms)  SELECT "users".* FROM "users"
 => #<ActiveRecord::Relation []> 

和 localhost:5000/users完全是空的……

当我的数据库中没有用户时，为什么会出现 User Exists 和 ROLLBACK？

Answer 1

用户存在查询来自验证器，用于检查是否没有用户使用与您尝试注册的电子邮件相同的电子邮件。永远不会有 INSERT 查询，因此您的用户永远不会被注册。

这可能是验证失败。在这种情况下，您的密码可能太短(默认设计密码长度验证要求长度至少为 8，您的只有 4)。

您收到了一个成功的 200 响应，因为它正在重定向回注册并显示一条说明验证失败的闪存消息。