「參數丟失或值爲空：用戶」

我試圖創建book以及創建user。所以表格Book嵌套在User中。但我根本無法進入，因爲我有這樣的錯誤：「參數丟失或值爲空：用戶」

參數是丟失或爲空值

我看了一下上鬆弛的每一個問題，人們得到這個錯誤。

但沒有適合我的情況。

所以，如果你有任何想法，請隨時提供幫助。

user.rb

class User < ApplicationRecord 
    devise :database_authenticatable, :registerable, 
     :recoverable, :rememberable, :trackable, :validatable 
    has_many :books 
    has_many :covers, through: :books 
    has_many :commands 
    accepts_nested_attributes_for :books 
end

book.rb

class Book < ApplicationRecord 
    has_one :cover 
    belongs_to :user, dependent: :destroy 
end

registrations_controller

class RegistrationsController < Devise::RegistrationsController 
    def new 
    build_resource(sign_up_params) 
    self.resource.books = Book.new 
    respond_with self.resource 
    end 

    def create 
    super 
    end 

    private 

    def sign_up_params 
    params.require(resource_name).permit(:email, :password, :password_confirmation, :books_attributes[:title, :author_first_name, :author_last_name]) 
    end 
end

我查了resource_name這是正確地等於:user

色器件/註冊/新

h2 
    | Sign up 
= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| 
    = devise_error_messages! 
    .field 
    = f.label :email 
    br 
    = f.email_field :email, autofocus: true 
    .field 
    = f.label :password 
    - if @minimum_password_length 
     em 
     | (
     = @minimum_password_length 
     | characters minimum) 
    br 
    = f.password_field :password, autocomplete: "off" 
    .field 
    = f.label :password_confirmation 
    br 
    = f.password_field :password_confirmation, autocomplete: "off" 
    = f.fields_for :books do |p| 
    = p.text_field :title 
    = p.text_field :author_first_name 
    = p.text_field :author_last_name 
    .actions 
    = f.submit "Sign up" 
= render "devise/shared/links"

EDIT

路由

Rails.application.routes.draw do 
    devise_for :users, controllers: {registrations: 'registrations'} 
    root 'home#index' 
end

日誌

Started GET "https://stackoverflow.com/users/sign_up" for ::1 at 2017-03-10 08:59:00 +0100 
Processing by RegistrationsController#new as HTML 
Completed 400 Bad Request in 1ms (ActiveRecord: 0.0ms) 



ActionController::ParameterMissing - param is missing or the value is empty: user: 
    actionpack (5.0.2) lib/action_controller/metal/strong_parameters.rb:309:in `require' 
    app/controllers/registrations_controller.rb:15:in `sign_up_params' 
    app/controllers/registrations_controller.rb:3:in `new' 
    actionpack (5.0.2) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action' 
    actionpack (5.0.2) lib/abstract_controller/base.rb:188:in `process_action' 
    actionpack (5.0.2) lib/action_controller/metal/rendering.rb:30:in `process_action' 
    actionpack (5.0.2) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:126:in `call' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:506:in `block (2 levels) in compile' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:455:in `call' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:101:in `__run_callbacks__' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:90:in `run_callbacks' 
    actionpack (5.0.2) lib/abstract_controller/callbacks.rb:19:in `process_action' 
    actionpack (5.0.2) lib/action_controller/metal/rescue.rb:20:in `process_action' 
    actionpack (5.0.2) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' 
    activesupport (5.0.2) lib/active_support/notifications.rb:164:in `block in instrument' 
    activesupport (5.0.2) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
    activesupport (5.0.2) lib/active_support/notifications.rb:164:in `instrument' 
    actionpack (5.0.2) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
    actionpack (5.0.2) lib/action_controller/metal/params_wrapper.rb:248:in `process_action' 
    activerecord (5.0.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    actionpack (5.0.2) lib/abstract_controller/base.rb:126:in `process' 
    actionview (5.0.2) lib/action_view/rendering.rb:30:in `process' 
    actionpack (5.0.2) lib/action_controller/metal.rb:190:in `dispatch' 
    actionpack (5.0.2) lib/action_controller/metal.rb:262:in `dispatch' 
    actionpack (5.0.2) lib/action_dispatch/routing/route_set.rb:50:in `dispatch' 
    actionpack (5.0.2) lib/action_dispatch/routing/route_set.rb:32:in `serve' 
    actionpack (5.0.2) lib/action_dispatch/routing/mapper.rb:16:in `block in <class:Constraints>' 
    actionpack (5.0.2) lib/action_dispatch/routing/mapper.rb:46:in `serve' 
    actionpack (5.0.2) lib/action_dispatch/journey/router.rb:39:in `block in serve' 
    actionpack (5.0.2) lib/action_dispatch/journey/router.rb:26:in `serve' 
    actionpack (5.0.2) 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 (5.0.2) lib/action_dispatch/middleware/cookies.rb:613:in `call' 
    activerecord (5.0.2) lib/active_record/migration.rb:553:in `call' 
    actionpack (5.0.2) lib/action_dispatch/middleware/callbacks.rb:38:in `block in call' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:97:in `__run_callbacks__' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:750:in `_run_call_callbacks' 
    activesupport (5.0.2) lib/active_support/callbacks.rb:90:in `run_callbacks' 
    actionpack (5.0.2) lib/action_dispatch/middleware/callbacks.rb:36:in `call' 
    actionpack (5.0.2) lib/action_dispatch/middleware/executor.rb:12:in `call' 
    actionpack (5.0.2) 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 (5.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call' 
    web-console (3.4.0) lib/web_console/middleware.rb:135:in `call_app' 
    web-console (3.4.0) lib/web_console/middleware.rb:28:in `block in call' 
    web-console (3.4.0) lib/web_console/middleware.rb:18:in `call' 
    actionpack (5.0.2) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call' 
    railties (5.0.2) lib/rails/rack/logger.rb:36:in `call_app' 
    railties (5.0.2) lib/rails/rack/logger.rb:24:in `block in call' 
    activesupport (5.0.2) lib/active_support/tagged_logging.rb:69:in `block in tagged' 
    activesupport (5.0.2) lib/active_support/tagged_logging.rb:26:in `tagged' 
    activesupport (5.0.2) lib/active_support/tagged_logging.rb:69:in `tagged' 
    railties (5.0.2) lib/rails/rack/logger.rb:24:in `call' 
    sprockets-rails (3.2.0) lib/sprockets/rails/quiet_assets.rb:13:in `call' 
    actionpack (5.0.2) 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 (5.0.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' 
    actionpack (5.0.2) lib/action_dispatch/middleware/executor.rb:12:in `call' 
    actionpack (5.0.2) lib/action_dispatch/middleware/static.rb:136:in `call' 
    rack (2.0.1) lib/rack/sendfile.rb:111:in `call' 
    railties (5.0.2) lib/rails/engine.rb:522:in `call' 
    puma (3.7.1) lib/puma/configuration.rb:232:in `call' 
    puma (3.7.1) lib/puma/server.rb:578:in `handle_request' 
    puma (3.7.1) lib/puma/server.rb:415:in `process_client' 
    puma (3.7.1) lib/puma/server.rb:275:in `block in run' 
    puma (3.7.1) lib/puma/thread_pool.rb:120:in `block in spawn_thread' 

Started POST "/__better_errors/8c394ae550fda307/variables" for ::1 at 2017-03-10 08:59:00 +0100

來源

2017-03-09 Orsay

嘗試改變'self.resource.books = Book.new'和'self.resource.books.build'和顯示日誌（輸入PARAMS）爲：編輯之後

我的代碼創建aciton –

我嘗試過，但日誌中沒有interessant：'ActionController :: ParameterMissing - param丟失或值爲空：user： actionpack（5.0.2）lib/action_controller/metal/strong_parameters.rb： 309：在'require'中 app/controllers/registrations_controller.rb：15：in'sign_up_params' app/controllers/registrations_controller.rb：3：in'new' actionpack（5.0。2）lib/action_controller/metal/basic_implicit_render.rb：4：在'send_action'.....' – Orsay

嘗試在'params.permit'中將'：books_attributes'更改爲'：book_attributes'。如果這沒有幫助，請顯示服務器日誌中記錄請求參數的部分。 – Raffael

我終於明白從哪裏傳來此錯誤。

當你打電話給你的參數，你只需要在create行動中打電話給他們。在new操作中調用它們會產生錯誤。

class RegistrationsController < Devise::RegistrationsController 
    def new 
    build_resource 
    self.resource.books = Book.new 
    respond_with self.resource 
    end 

    ...... 

end

來源

2017-03-15 09:04:19 Orsay

「參數丟失或值爲空：用戶」

回答

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