就用户注册而言，我们有：
<%= form_for(resource, as: resource_name, url: registration_path(resource_name), class: "") do |f| %>
<div class="panel panel-body login-form">
<% if notice %>
<div class="alert bg-success alert-styled-left">
<button type="button" class="close" data-dismiss="alert"><span>×</span><span class="sr-only">Close</span></button>
<%= notice %>
</div>
<% end %>
<% if alert %>
<div class="alert bg-warning alert-styled-left">
<button type="button" class="close" data-dismiss="alert"><span>×</span><span class="sr-only">Close</span></button>
<%= alert %>
</div>
<% end %>
<div class="text-center">
<img src="https://s3.amazonaws.com/doux-cdn/doux_logo_v3.png" class="img-responsive" width="100px" style="margin: 0 auto;">
<h5 class="content-group-lg">Registro Doux<small class="display-block">Ingresa tus credenciales de registro</small></h5>
</div>
<div class="form-group has-feedback has-feedback-left">
<%= f.text_field :rfc, autocomplete: "off", autofocus: false, class: "form-control", placeholder: "RFC", value: "" %>
<div class="form-control-feedback">
<i class="icon-cabinet text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<%= f.text_field :company, autocomplete: "off", autofocus: false, class: "form-control", placeholder: "Nombre empresa" %>
<div class="form-control-feedback">
<i class="icon-cube text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<%= f.email_field :email, autofocus: false, class: "form-control", placeholder: "Email" %>
<div class="form-control-feedback">
<i class="icon-user text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<%= f.password_field :password, autocomplete: "off", class: "form-control", placeholder: "Contraseña" %>
<div class="form-control-feedback">
<i class="icon-lock2 text-muted"></i>
</div>
</div>
<div class="form-group has-feedback has-feedback-left">
<%= f.password_field :password_confirmation, autocomplete: "off", class: "form-control", placeholder: "Repetir contraseña" %>
<div class="form-control-feedback">
<i class="icon-lock2 text-muted"></i>
</div>
</div>
<div class="form-group login-options">
<div class="row">
<div class="col-sm-6">
<label class="checkbox-inline">
<input type="checkbox" class="styled" checked="checked">
Recordar
</label>
</div>
<div class="col-sm-6 text-right">
<a href="/users/sign_in">Ya tengo cuenta</a>
</div>
</div>
</div>
<div class="form-group">
<button type="submit" data-loading-text="<i class='icon-spinner4 spinner position-left'></i> Registrando" class="btn btn-primary btn-block btn-loading"><i class="icon-spinner10 position-left"></i> Registrarme</button>
</div>
<span class="help-block text-center no-margin">Tu acceso es unico y será monitoreado.</a></span>
</div>
<% end %>
0ur registrations_controller.rb：
class RegistrationsController < Devise::RegistrationsController
private
# Modified Devise params for user login
def sign_up_params
params.require(:user).permit(:company, :rfc, :email, :password, :password_confirmation)
end
def after_sign_up_path_for(resource)
"/profile/index"
end
def after_inactive_sign_up_path_for(resource)
"/profile/index"
end
end
我们的模型：
class User < ApplicationRecord
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
end
我们的路线：
Rails.application.routes.draw do
devise_for :users, :controllers => { registrations: 'registrations' }
end
我们的日志：
Started POST "/users" for 127.0.0.1 at 2018-07-13 12:05:32 -0500
Processing by RegistrationsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"ZRpnhK1pWSJgTzHJnra49DWX3OTnX4mkdfbzI35Ehyd+W5XhZWPbp/dJbzLItF855mfseOPlIm99Ag/JsL9KVw==", "user"=>{"rfc"=>"RFC", "company"=>"Empresa", "email"=>"ulises.carreon@realhost.com.mx", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]"}}
(45.9ms) BEGIN
↳ /Users/ulisescarreon/.rvm/rubies/ruby-2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
User Exists (46.1ms) SELECT 1 AS one FROM `users` WHERE `users`.`email` = BINARY 'ulises.carreon@realhost.com.mx' LIMIT 1
↳ /Users/ulisescarreon/.rvm/rubies/ruby-2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
(46.8ms) ROLLBACK
↳ /Users/ulisescarreon/.rvm/rubies/ruby-2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98
Rendering devise/registrations/new.html.erb within layouts/devise_doux_register
Rendered devise/shared/_links.html.erb (1.1ms)
Rendered devise/registrations/new.html.erb within layouts/devise_doux_register (6.4ms)
Completed 200 OK in 331ms (Views: 49.3ms | ActiveRecord: 138.8ms)
我们可以看到，gem实际上可以验证现有的电子邮件，并且我不会捕捉到该错误，在登录时，警报/通知可以正常运行，但在注册时只能运行：“ <％= devise_error_messages！％>”
我们缺少什么？