ruby-on-rails – Rails设计用户存在空DB

家园

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Default Devise :: RegistrationsController.

这在提交时出现：

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)

但是,在rails控制台中：

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

和localhost：5000 /用户完全是空的…

当我的数据库中没有用户时,为什么我会收到用户存在和ROLLBACK？