提交注册信息时出现以下错误：
NoMethodError in Devise::RegistrationsController#create
undefined method `downcase!' for 0:Fixnum
\ livu_pamatskola \应用\视图\设计\注册\ new.html.erb：
<h1>Reģistrācija</h1>
<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<div id="contacts">
<div id="title"><%= f.label "Vārds" %></div>
<div id="information"><%= f.text_field :name %></div>
<div style="clear: both;"></div>
<div id="title"><%= f.label "Uzvārds" %></div>
<div id="information"><%= f.text_field :surname %></div>
<div style="clear: both;"></div>
<div id="title"><%= f.label "E-pasts" %></div>
<div id="information"><%= f.text_field :email, :autofocus => true %></div>
<div style="clear: both;"></div>
<div id="title"><%= f.label "Parole" %></div>
<div id="information"><%= f.password_field :password %></div>
<div style="clear: both;"></div>
<div id="title"><%= f.label "Vēlreiz parole" %></div>
<div id="information"><%= f.password_field :password_confirmation %></div>
</div>
<div><%= f.submit "Reģistrēties", :id => "button-link" %></div>
<% end %>
据我所知，我知道注册控制器存在问题，但我没有这样的控制器。我已经在互联网上搜索了解决方案，但我没有找到任何东西，只花了很多时间，所以我需要你的帮助。
跟踪：
activesupport (3.2.8) lib/active_support/core_ext/object/try.rb:36:in `try'
devise (2.2.1) lib/devise/models/authenticatable.rb:172:in `apply_to_attribute_or_variable'
devise (2.2.1) lib/devise/models/authenticatable.rb:163:in `block in downcase_keys'
devise (2.2.1) lib/devise/models/authenticatable.rb:163:in `each'
devise (2.2.1) lib/devise/models/authenticatable.rb:163:in `downcase_keys'
activesupport (3.2.8) lib/active_support/callbacks.rb:407:in `_run__271922054__validation__371060191__callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_validation_callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks'
activemodel (3.2.8) lib/active_model/validations/callbacks.rb:53:in `run_validations!'
activemodel (3.2.8) lib/active_model/validations.rb:194:in `valid?'
activerecord (3.2.8) lib/active_record/validations.rb:69:in `valid?'
activerecord (3.2.8) lib/active_record/validations.rb:77:in `perform_validations'
activerecord (3.2.8) lib/active_record/validations.rb:50:in `save'
activerecord (3.2.8) lib/active_record/attribute_methods/dirty.rb:22:in `save'
activerecord (3.2.8) lib/active_record/transactions.rb:241:in `block (2 levels) in save'
activerecord (3.2.8) lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status'
activerecord (3.2.8) lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
activerecord (3.2.8) lib/active_record/transactions.rb:208:in `transaction'
activerecord (3.2.8) lib/active_record/transactions.rb:293:in `with_transaction_returning_status'
activerecord (3.2.8) lib/active_record/transactions.rb:241:in `block in save'
activerecord (3.2.8) lib/active_record/transactions.rb:252:in `rollback_active_record_state!'
activerecord (3.2.8) lib/active_record/transactions.rb:240:in `save'
devise (2.2.1) app/controllers/devise/registrations_controller.rb:15:in `create'
actionpack (3.2.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.8) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.8) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.8) lib/active_support/callbacks.rb:436:in `_run__1051681660__process_action__714589613__callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.8) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.8) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.8) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.8) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.8) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.8) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.8) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:36:in `call'
actionpack (3.2.8) lib/action_dispatch/routing/mapper.rb:42:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:600:in `call'
warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
warden (1.2.1) lib/warden/manager.rb:34:in `catch'
warden (1.2.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.5) lib/rack/etag.rb:23:in `call'
rack (1.4.5) lib/rack/conditionalget.rb:35:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/cookies.rb:339:in `call'
activerecord (3.2.8) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `_run__646451992__call__371060191__callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.8) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.8) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.8) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
actionpack (3.2.8) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.8) lib/rails/engine.rb:479:in `call'
railties (3.2.8) lib/rails/application.rb:223:in `call'
rack (1.4.5) lib/rack/content_length.rb:14:in `call'
railties (3.2.8) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service'
c:/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
c:/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
c:/Ruby193/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
问题已解决：
当我为Devise创建用户模型时，我在迁移中包含了email属性。在将设计添加到用户模型时存在问题，它默认添加电子邮件字段，因此它与我之前的迁移相冲突。
我很高兴我解决了它，因为我没有时间处理这些错误。谢谢大家的帮助。
答案 0 :(得分：1)
您的用户模型看起来有错误的属性类型。确保您的数据库包含有效的字段类型。点击此处了解详情：https://github.com/plataformatec/devise
您的问题可能与已知的不区分大小写的密钥问题有关。将以下代码段添加到config / initializers / devise.rb文件中：http://anti-pattern.com/case-insensitive-keys-with-devise
注册控制器在Devise库中定义，如果您将设计添加到Gemfile，它将自动添加到您的应用程序控制器中。
答案 1 :(得分：1)
您是否提交了某些字段的数字信息？就像用户名“123”一样？对于Devise来说，如果它将一个数字作为字符串，但认为它实际上是一个数字，这可能是一个问题。