Неинициализированная константа в демонстрационном приложении Ruby on Rails

Я новичок в RoR, поэтому я следую демонстрационному приложению, добавив, что я использую mongo после создания нового проекта, который просто моделирует пользователя с именем и адрес электронной почты, например:Неинициализированная константа в демонстрационном приложении Ruby on Rails

rails generate scaffold User name:string email:string

Таким образом, судя по всему, что пошло хорошо, после того, как сервер работает я иду

http://mypc.com:3000/users

, там я получил эту exceptio п:

NameError in UsersController#index 

uninitialized constant UsersController::User

Трассировка Приложение показывает:

app/controllers/users_controller.rb:5:in `index'

Эта линия:

class UsersController < ApplicationController 
    # GET /users 
    # GET /users.json 
    def index 
    @users = User.all # Line number 5 

    respond_to do |format| 
     format.html # index.html.erb 
     format.json { render json: @users } 
    end 
    end

Структура трассировки показывает:

actionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (3.2.13) lib/abstract_controller/base.rb:167:in `process_action' 
actionpack (3.2.13) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (3.2.13) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.2.13) lib/active_support/callbacks.rb:414:in `_run__554445868623666263__process_action__1776616819222781299__callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.13) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.2.13) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (3.2.13) lib/action_controlleactionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (3.2.13) lib/abstract_controller/base.rb:167:in `process_action' 
actionpack (3.2.13) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (3.2.13) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.2.13) lib/active_support/callbacks.rb:414:in `_run__554445868623666263__process_action__1776616819222781299__callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.13) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.2.13) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.13) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.2.13) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' 
actionpack (3.2.13) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.2.13) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.2.13) lib/action_controller/metal.rb:203:in `dispatch' 
actionpack (3.2.13) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.2.13) lib/action_controller/metal.rb:246:in `block in action' 
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `call' 
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:36: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 (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in `call' 
actionpack (3.2.13) 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:25:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.2.13) 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 (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `_run__3675277533868058491__call__1636177048325232092__callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
railties (3.2.13) lib/rails/rack/logger.rb:32:in `call_app' 
railties (3.2.13) lib/rails/rack/logger.rb:16:in `block in call' 
activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in `tagged' 
railties (3.2.13) lib/rails/rack/logger.rb:16:in `call' 
actionpack (3.2.13) 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 (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.4.5) lib/rack/lock.rb:15:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in `call' 
railties (3.2.13) lib/rails/engine.rb:479:in `call' 
railties (3.2.13) lib/rails/application.rb:223:in `call' 
rack (1.4.5) lib/rack/content_length.rb:14:in `call' 
railties (3.2.13) lib/rails/rack/log_tailer.rb:17:in `call' 
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service' 
/usr/share/ruby/webrick/httpserver.rb:138:in `service' 
/usr/share/ruby/webrick/httpserver.rb:94:in `run' 
/usr/share/ruby/webrick/server.rb:191:in `block in start_thread'r/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.13) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.2.13) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' 
actionpack (3.2.13) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.2.13) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.2.13) lib/action_controller/metal.rb:203:in `dispatch' 
actionpack (3.2.13) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.2.13) lib/action_controller/metal.rb:246:in `block in action' 
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `call' 
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:36: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 (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in `call' 
actionpack (3.2.13) 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:25:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.2.13) 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 (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `_run__3675277533868058491__call__1636177048325232092__callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
railties (3.2.13) lib/rails/rack/logger.rb:32:in `call_app' 
railties (3.2.13) lib/rails/rack/logger.rb:16:in `block in call' 
activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in `tagged' 
railties (3.2.13) lib/rails/rack/logger.rb:16:in `call' 
actionpack (3.2.13) 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 (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.4.5) lib/rack/lock.rb:15:in `call' 
actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in `call' 
railties (3.2.13) lib/rails/engine.rb:479:in `call' 
railties (3.2.13) lib/rails/application.rb:223:in `call' 
rack (1.4.5) lib/rack/content_length.rb:14:in `call' 
railties (3.2.13) lib/rails/rack/log_tailer.rb:17:in `call' 
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service' 
/usr/share/ruby/webrick/httpserver.rb:138:in `service' 
/usr/share/ruby/webrick/httpserver.rb:94:in `run' 
/usr/share/ruby/webrick/server.rb:191:in `block in start_thread'

и индекс файла». html.erb 'содержит:

<% @users.each do |user| %> 
    <tr> 
    <td><%= user.name %></td> 
    <td><%= user.email %></td> 
    <td><%= link_to 'Show', user %></td> 
    <td><%= link_to 'Edit', edit_user_path(user) %></td> 
    <td><%= link_to 'Destroy', user, method: :delete, data: { confirm: 'Are you sure?' } %></td> 
    </tr> 
<% end %>

Итак, что может пойти не так с этим примером?

источник

2013-06-16 Juan Pablo

Столкнулись 'грабли БД: migrate'? – nemesv

Да, я тоже это сделал, я забыл упомянуть об этом, спасибо –

Что у вас есть в модели? –

создать приложение файл/модели/user.rb

#app/models/user.rb 
    class User < ActiveRecord::Base 

    end

источник

2013-10-17 20:44:35

Неинициализированная константа в демонстрационном приложении Ruby on Rails

ответ

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