rails tutorial ch 2 error noMethodError:undefined method'micropost'

Question

我是一个新的RoR并且正在完成轨道教程:第2章.

我正在使用Ubuntu 12.04 LTS,使用Sublime Text 2虚拟化.我使用Terminal作为我的命令提示符.

http://ruby.railstutorial.org/ruby-on-rails-tutorial-book

我有一些试验和错误,但现在我被困住了.

我正在研究Demo_app并且遇到图2.3.3我已经测试了我的localhost:3000并且已经生成了/ users /和/ microposts/pages,并且一切都在功能上运行.即新的,编辑,破坏等

我完成了用户和微博耙,'捆绑exec rake db:migrate',显然更新了数据模型.

我现在通过在终端中键入'ruby console'进入ruby控制台完成后我得到1.9.1:001> first_user = User.first,响应是,User Load(0.1ms)SELECT"users".*FROM"users "限制1

=>#

我现在明白了

 1.9.1 :002 > and I type first_user.microposts

这是我用include命令得到的结果错误

1.9.1 :001 > first_user = User.first
  User Load (0.1ms)  SELECT "users".* FROM "users" LIMIT 1
 => #<User id: 1, name: "User Name", email: "example@example.com", created_at: "2013-06-23 23:17:01", updated_at: "2013-06-23 23:17:01"> 
1.9.1 :002 > first_user.microposts
NoMethodError: undefined method `microposts' for #<User:0xa6e8afc>
    from /home/user/rails_projects/demo_app/vendor/bundle/ruby/1.9.1/gems/activemodel-3.2.13/lib/active_model/attribute_methods.rb:407:in `method_missing'
    from /home/user/rails_projects/demo_app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/attribute_methods.rb:149:in `method_missing'
    from (irb):2
    from /home/user/rails_projects/demo_app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in `start'
    from /home/user/rails_projects/demo_app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start'
    from /home/user/rails_projects/demo_app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

我想我也会发布我认为可能与错误有关的其他文件.

我的micropost.rb

    class Micropost < ActiveRecord::Base
    attr_accessible :content, :user_id

   belongs_to :user

   validates :content, :length => { :maximum => 140 }
   end

我的users_controller.rb

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

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

  # GET /users/1
  # GET /users/1.json
  def show
    @user = User.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @user }
    end
  end

  # GET /users/new
  # GET /users/new.json
  def new
    @user = User.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @user }
    end
  end

  # GET /users/1/edit
  def edit
    @user = User.find(params[:id])
  end

  # POST /users
  # POST /users.json
  def create
    @user = User.new(params[:user])

    respond_to do |format|
      if @user.save
        format.html { redirect_to @user, notice: 'User was successfully created.' }
        format.json { render json: @user, status: :created, location: @user }
      else
       format.html { render action: "new" }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
     end
  end

  # PUT /users/1
  # PUT /users/1.json
  def update
    @user = User.find(params[:id])

    respond_to do |format|
     if @user.update_attributes(params[:user])
       format.html { redirect_to @user, notice: 'User was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /users/1
  # DELETE /users/1.json
  def destroy
    @user = User.find(params[:id])
    @user.destroy

    respond_to do |format|
      format.html { redirect_to users_url }
      format.json { head :no_content }
     end
  end
end

我的user.rb文件

class User < ActiveRecord::Base
    attr_accessible :email, :name
    has_many :microposts
end

我的index.html.erb文件

  </tr>

<% @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 %>
</table>

<br />

<%= link_to 'New User', new_user_path %>

我的routes.rb

DemoApp::Application.routes.draw do
  resources :microposts


  resources :users

#...
end

我想我的Gemfile

source 'https://rubygems.org'

gem 'rails', '3.2.13'

group :development do
    gem 'sqlite3', '1.3.5'
end
# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '3.2.5'
  gem 'coffee-rails', '3.2.2'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', :platforms => :ruby

  gem 'uglifier', '1.2.3'
end

gem 'jquery-rails', '2.0.2'

group :production do
    gem 'pg', '0.12.2'
end

我所知道的唯一复杂问题是,在使用该命令的2.1上进行教程时

捆绑更新

然后

捆绑安装 - 没有生产

我不得不扭转这个过程以使更新正常工作......我查看了stackoverflow并发现了一些其他的工作...也许是这个或某种方式我设置我的服务器或原始宝石,红宝石,rails安装.

谢谢你的帮助,如果我没有正确发布,我会接受建议.

Tkin1

Answer 1

你的用户模型看起来像

class User < ActiveRecord::Base
  attr_accessible :email, :name
end

没有定义关联.做了:

class User < ActiveRecord::Base
  attr_accessible :email, :name
  has_many: :microposts
end

您在帖子中提到过它,但它并不反映您的代码