ruby-on-rails - 未定义方法 `validatable?' 对于 nil :NilClass for Devise mapping

Question

我在使用 Devise 编辑用户时遇到一些问题。 该请求似乎是通过正确的路由发送的:

Request parameters  
{"controller"=>"users/registrations", "action"=>"edit"}

但我收到此错误:

NoMethodError in Users::RegistrationsController#edit

undefined method `validatable?' for nil:NilClass

Extracted source (around line #170):

# Sets minimum password length to show to user
  def set_minimum_password_length
    if devise_mapping.validatable? # <- ERROR HIGHLIGHTED HERE
      @minimum_password_length = resource_class.password_length.min
    end
  end

RegistrationsController 相当简单:

class Users::RegistrationsController < Devise::RegistrationsController
  before_action :configure_sign_up_params, only: [:create]
  before_action :configure_account_update_params, only: [:update]

  # GET /resource/sign_up
  def new
    super
  end

  # POST /resource
  def create
    super
  end

  # GET /resource/edit
  def edit
    super
  end

编辑页面的 View :

<h2>Edit <%= resource_name.to_s.humanize %></h2>

<%= form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put }) do |f| %>
  <%= devise_error_messages! %>

  <div class="field">
    <%= f.label :email %><br />
    <%= f.email_field :email, autofocus: true %>
  </div>

  <% if devise_mapping.confirmable? && resource.pending_reconfirmation? %>
    <div>Currently waiting confirmation for: <%= resource.unconfirmed_email %></div>
  <% end %>

  <div class="field">
    <%= f.label :password %> <i>(leave blank if you don't want to change it)</i><br />
    <%= f.password_field :password, autocomplete: "off" %>

    //deleting this conditional makes no difference.
    <% if @minimum_password_length %>
      <br />
      <em><%= @minimum_password_length %> characters minimum</em>
    <% end %>
  </div>

  <div class="field">
    <%= f.label :password_confirmation %><br />
    <%= f.password_field :password_confirmation, autocomplete: "off" %>
  </div>

  <div class="field">
    <%= f.label :current_password %> <i>(we need your current password to confirm your changes)</i><br />
    <%= f.password_field :current_password, autocomplete: "off" %>
  </div>

  <div class="actions">
    <%= f.submit "Update" %>
  </div>
<% end %>

<h3>Cancel my account</h3>

<p>Unhappy? <%= button_to "Cancel my account", registration_path(resource_name), data: { confirm: "Are you sure?" }, method: :delete %></p>

<%= link_to "Back", :back %>

如有任何帮助，我们将不胜感激。

这也是堆栈跟踪:

Started GET "/users/edit" for ::1 at 2017-06-22 15:27:00 +0200
Processing by Users::RegistrationsController#edit as HTML
Completed 500 Internal Server Error in 2ms (ActiveRecord: 0.0ms)



NoMethodError - undefined method `validatable?' for nil:NilClass:
  devise (4.3.0) app/controllers/devise_controller.rb:170:in `set_minimum_password_length'
  activesupport (5.0.1) lib/active_support/callbacks.rb:382:in `block in make_lambda'
  activesupport (5.0.1) lib/active_support/callbacks.rb:150:in `block (2 levels) in halting_and_conditional'
  actionpack (5.0.1) lib/abstract_controller/callbacks.rb:12:in `block (2 levels) in <module:Callbacks>'
  activesupport (5.0.1) lib/active_support/callbacks.rb:151:in `block in halting_and_conditional'
  activesupport (5.0.1) lib/active_support/callbacks.rb:454:in `block in call'
  activesupport (5.0.1) lib/active_support/callbacks.rb:454:in `call'
  activesupport (5.0.1) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
  activesupport (5.0.1) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks'
  activesupport (5.0.1) lib/active_support/callbacks.rb:90:in `run_callbacks'
  actionpack (5.0.1) lib/abstract_controller/callbacks.rb:19:in `process_action'
  actionpack (5.0.1) lib/action_controller/metal/rescue.rb:20:in `process_action'
  actionpack (5.0.1) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
  activesupport (5.0.1) lib/active_support/notifications.rb:164:in `block in instrument'
  activesupport (5.0.1) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
  activesupport (5.0.1) lib/active_support/notifications.rb:164:in `instrument'
  actionpack (5.0.1) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (5.0.1) lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
  searchkick (2.1.1) lib/searchkick/logging.rb:209:in `process_action'
  activerecord (5.0.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (5.0.1) lib/abstract_controller/base.rb:126:in `process'
  actionview (5.0.1) lib/action_view/rendering.rb:30:in `process'
  actionpack (5.0.1) lib/action_controller/metal.rb:190:in `dispatch'
  actionpack (5.0.1) lib/action_controller/metal.rb:262:in `dispatch'
  actionpack (5.0.1) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
  actionpack (5.0.1) lib/action_dispatch/routing/route_set.rb:32:in `serve'
  actionpack (5.0.1) lib/action_dispatch/journey/router.rb:39:in `block in serve'
  actionpack (5.0.1) lib/action_dispatch/journey/router.rb:26:in `serve'
  actionpack (5.0.1) lib/action_dispatch/routing/route_set.rb:725:in `call'
  warden (1.2.7) lib/warden/manager.rb:36:in `block in call'
  warden (1.2.7) lib/warden/manager.rb:35:in `call'
  rack (2.0.1) lib/rack/etag.rb:25:in `call'
  rack (2.0.1) lib/rack/conditional_get.rb:25:in `call'
  rack (2.0.1) lib/rack/head.rb:12:in `call'
  rack (2.0.1) lib/rack/session/abstract/id.rb:222:in `context'
  rack (2.0.1) lib/rack/session/abstract/id.rb:216:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/cookies.rb:613:in `call'
  activerecord (5.0.1) lib/active_record/migration.rb:553:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/callbacks.rb:38:in `block in call'
  activesupport (5.0.1) lib/active_support/callbacks.rb:97:in `__run_callbacks__'
  activesupport (5.0.1) lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
  activesupport (5.0.1) lib/active_support/callbacks.rb:90:in `run_callbacks'
  actionpack (5.0.1) lib/action_dispatch/middleware/callbacks.rb:36:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/executor.rb:12:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
  better_errors (2.1.1) lib/better_errors/middleware.rb:84:in `protected_app_call'
  better_errors (2.1.1) lib/better_errors/middleware.rb:79:in `better_errors_call'
  better_errors (2.1.1) lib/better_errors/middleware.rb:57:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call'
  web-console (3.1.1) lib/web_console/middleware.rb:131:in `call_app'
  web-console (3.1.1) lib/web_console/middleware.rb:28:in `block in call'
  web-console (3.1.1) lib/web_console/middleware.rb:18:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
  railties (5.0.1) lib/rails/rack/logger.rb:36:in `call_app'
  railties (5.0.1) lib/rails/rack/logger.rb:24:in `block in call'
  activesupport (5.0.1) lib/active_support/tagged_logging.rb:69:in `block in tagged'
  activesupport (5.0.1) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (5.0.1) lib/active_support/tagged_logging.rb:69:in `tagged'
  railties (5.0.1) lib/rails/rack/logger.rb:24:in `call'
  sprockets-rails (3.2.0) lib/sprockets/rails/quiet_assets.rb:13:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/request_id.rb:24:in `call'
  rack (2.0.1) lib/rack/method_override.rb:22:in `call'
  rack (2.0.1) lib/rack/runtime.rb:22:in `call'
  activesupport (5.0.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/executor.rb:12:in `call'
  actionpack (5.0.1) lib/action_dispatch/middleware/static.rb:136:in `call'
  rack (2.0.1) lib/rack/sendfile.rb:111:in `call'
  railties (5.0.1) lib/rails/engine.rb:522:in `call'
  puma (3.0.0) lib/puma/configuration.rb:221:in `call'
  puma (3.0.0) lib/puma/server.rb:723:in `handle_request'
  puma (3.0.0) lib/puma/server.rb:406:in `process_client'
  puma (3.0.0) lib/puma/server.rb:271:in `block in run'
  puma (3.0.0) lib/puma/thread_pool.rb:111:in `block in spawn_thread'

Answer 1

问题是 devise 不知道您在自定义 Controller 中使用的资源是什么。因此，您需要使用资源名称将所有路由包装到自定义 Controller ，如下所示:

  # config/routes.rb

  devise_scope :user do
    root to: 'users/registrations#new'
  end

来源:https://www.rubydoc.info/github/plataformatec/devise/ActionDispatch%2FRouting%2FMapper:devise_scope