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当我尝试添加新引脚时,我不能。相反,我收到此错误:

NoMethodError in PinsController#create

undefined method `name' for #<pin:0x000001011b9638>

应用程序跟踪 | 框架跟踪 | 全跟踪

app/controllers/pins_controller.rb:48:in `block in create'
app/controllers/pins_controller.rb:47:in `create'

要求

参数:

{"utf8"=>"✓",
"authenticity_token"=>"n9E2nob/KBzu20PEzYoQWXnibAUR5TH6iPWNd66383k=",
"pin"=>{"description"=>"stea"},
"commit"=>"Create Pin"}

pin_controller.rb

def create

@pin = current_user.pins.new(params[:pin])

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

应用程序/模型/用户.rb

class User < ActiveRecord::Base

devise :database_authenticatable, :registerable,
     :rememberable, :trackable, :validatable

attr_accessible :email, :password, :password_confirmation, :remember_me, :name

has_many :pins, :dependent => :destroy
end

路线.rb

Omrails::Application.routes.draw do
 resources :pins

 devise_for :users

 root :to => 'pages#home'
 get 'about' => 'pages#about'

应用程序/模型/pin.rb

class Pin < ActiveRecord::Base
  attr_accessible :description

  validates :description, presence: true
    validates :name, presence: true

  belongs_to :user
    validates :user_id, presence: true
 end

db/migrate/create_pins

class CreatePins < ActiveRecord::Migration
  def change
    create_table :pins do |t|
      t.string :description

      t.timestamps
    end
  end
end

db/migrate/add_user_id_to_pins.rb

class AddUserIdToPins < ActiveRecord::Migration
  def change
    add_column :pins, :user_id, :integer
    add_index :pins, :user_id
  end
end

db/migrate/add_name_to_users.rb

class AddNameToUsers < ActiveRecord::Migration
  def change
    add_column :users, :name, :string
  end
end

关于出了什么问题的任何想法?

不确定它是否相关,但这曾经有效。我能够跟随Mattan Griffel 的一个月 Rails 课程——添加 Assoc bt Pins 和用户视频,直到 29 分 50 秒,但后来我意识到我必须跳回定制设计,因为我忘了添加简单的表单。

现在已经添加了简单的表格,我正在努力前进 - 并被困在这里:(

更新:我运行了 migrate redo 来创建 pin 并将用户 id 添加到 pin。然后我删除了验证名称行。现在我在创建 pin 时收到以下错误

ActiveRecord::UnknownAttributeError in PinsController#new

unknown attribute: user_id 
app/controllers/pins_controller.rb:29:in `new'

pin_controller.rb

  def new
    @pin = current_user.pins.new

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

非常感谢您的帮助

数据库/schema.rb

ActiveRecord::Schema.define(:version => 20130828163738) do

  create_table "pins", :force => true do |t|
    t.string   "description"
    t.datetime "created_at",  :null => false
    t.datetime "updated_at",  :null => false
  end

  create_table "users", :force => true do |t|
    t.string   "email",                  :default => "", :null => false
    t.string   "encrypted_password",     :default => "", :null => false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          :default => 0
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.datetime "created_at",                             :null => false
    t.datetime "updated_at",                             :null => false
  end

  add_index "users", ["email"], :name => "index_users_on_email", :unique => true
  add_index "users", ["reset_password_token"], :name =>     "index_users_on_reset_password_token", :unique => true

end
4

1 回答 1

3

您正在验证模型中是否存在,:namePin它没有:name字段。你User有。

只需validates :name, presence: true从您的Pin模型中删除(第 5 行)。

发生的事情是 Rails 在尝试保存Pin模型时会运行所有验证。当它在 上遇到存在验证时:name,它将检查是否@pin.name为空。但问题是您的Pin模型没有名称方法。所以它会引发这个错误。

如果您确实希望您的Pin模型具有name,请将其添加到pins表中:

$ rails g migration add_name_to_pins name:string
$ rake db:migrate
于 2013-09-01T23:19:26.487 回答