rails NoMethodError：未定义的方法“酒店”

Question

我是 Rails 新手。当我完成 Hartl 的教程时，类似的代码也有效。不同之处在于有一个 Micropost 模型，现在我为自己的应用创建了 Hotel 模型。

而且模型规格没有通过。我认为这个问题与关联有关，但谁知道......昨天花了一整天，但无法让他们通过。我很感激任何帮助。谢谢！

这是错误和我的代码：

Failures:

  1) Hotel 
     Failure/Error: before { @hotel = user.hotel.build(title: "Saffron") }
     NoMethodError:
       undefined method `hotel' for #<User:0xb3c2d2c>
     # ./spec/models/hotel_spec.rb:6:in `block (2 levels) in <top (required)>'

  2) Hotel 
     Failure/Error: before { @hotel = user.hotel.build(title: "Saffron") }
     NoMethodError:
       undefined method `hotel' for #<User:0xb5b1200>
     # ./spec/models/hotel_spec.rb:6:in `block (2 levels) in <top (required)>'

  3) Hotel 
     Failure/Error: before { @hotel = user.hotel.build(title: "Saffron") }
     NoMethodError:
       undefined method `hotel' for #<User:0xb7364b8>
     # ./spec/models/hotel_spec.rb:6:in `block (2 levels) in <top (required)>'

  4) Hotel 
     Failure/Error: before { @hotel = user.hotel.build(title: "Saffron") }
     NoMethodError:
       undefined method `hotel' for #<User:0xb42a9cc>
     # ./spec/models/hotel_spec.rb:6:in `block (2 levels) in <top (required)>'

  5) Hotel when user_id is not present 
     Failure/Error: before { @hotel = user.hotel.build(title: "Saffron") }
     NoMethodError:
       undefined method `hotel' for #<User:0xbc7ba40>
     # ./spec/models/hotel_spec.rb:6:in `block (2 levels) in <top (required)>'

  6) Hotel user 
     Failure/Error: before { @hotel = user.hotel.build(title: "Saffron") }
     NoMethodError:
       undefined method `hotel' for #<User:0xbefae4c>
     # ./spec/models/hotel_spec.rb:6:in `block (2 levels) in <top (required)>'

Finished in 1.11 seconds
33 examples, 6 failures

Failed examples:

rspec ./spec/models/hotel_spec.rb:10 # Hotel 
rspec ./spec/models/hotel_spec.rb:12 # Hotel 
rspec ./spec/models/hotel_spec.rb:11 # Hotel 
rspec ./spec/models/hotel_spec.rb:15 # Hotel 
rspec ./spec/models/hotel_spec.rb:19 # Hotel when user_id is not present 
rspec ./spec/models/hotel_spec.rb:13 # Hotel user

酒店.rb

class Hotel < ActiveRecord::Base
  belongs_to :user
  default_scope -> { order('created_at DESC') }
  validates :user_id, presence: true
end

用户.rb

class User < ActiveRecord::Base
  has_many :hotels
  before_save { email.downcase! }
  before_create :create_remember_token

  has_secure_password  
  validates :name, presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i
  validates :email, presence: true, format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
  validates :password, length: { minimum: 6 }
  .....

hotel_spec.rb

require 'spec_helper'

describe Hotel do

  let(:user) { FactoryGirl.create(:user) }
  before { @hotel = user.hotel.build(title: "Saffron") }

  subject { @hotel }

  it { should respond_to(:title) }
  it { should respond_to(:user_id) }
  it { should respond_to(:user) }
  its(:user) { should eq user }

  it { should be_valid }

  describe "when user_id is not present" do
    before { @hotel.user_id = nil }
    it { should_not be_valid }
  end
end

Migration for Hotels 表

class CreateHotels < ActiveRecord::Migration
  def change
    create_table :hotels do |t|
      t.string :title
      t.integer :user_id

      t.timestamps
    end
    add_index :hotels, [:user_id, :created_at]
  end
end

Answer 1

欢迎来到轨道

您应该阅读guide on associations

此代码表示用户拥有许多酒店（带有s）：

class User < ActiveRecord::Base
  has_many :hotels

因此，如果您要查找 user 的所有酒店，您可以使用代码 user.hotels，这是一个（许多酒店的）集合，因此您可以使用所有 ruby​​ 和 rails 集合方法。例如：

# This will output to your console the name of each hotels linked to that user
user.hotels.each do |hotel|
  puts hotel.name
end

现在，如果您正在寻找该系列中的第一家酒店，您可以使用users.hotels.first

还有更多的可能。阅读我在消息开头链接的指南，你也可以看看http://railscasts.com 有很多免费的好资料（有些是收费的，但对于基础学习，免费剧集非常好）