Rails教程第11章错误"uninitialized constant User::Relationships“

Question

我一直收到错误消息

   uninitialized constant User::Relationships

在学习rails教程的第11章时。

以下是我在浏览器中登录时试图访问主页时出现的完整错误。

    Extracted source (around line #11):

8:          </a>
9:          <a href="<%= followers_user_path(@user) %>">
10:         <strong id="followers" class="stat">
11:             <%= @user.followers.count %>
12:         </strong>
13:         followers
14:     </a>

我已经多次阅读了这一章，并检查了每一行代码，但有时您的眼睛会欺骗您，所以下面是其余的代码

users.rb

class User < ActiveRecord::Base
attr_accessible :email, :name, :password, :password_confirmation
has_secure_password

has_many :microposts, dependent: :destroy 
has_many :relationships, foreign_key: "follower_id", dependent: :destroy
has_many :followed_users, through: :relationships, source: :followed 
has_many :reverse_relationships, foreign_key: "followed_id",
                               class_name: "Relationships",
                               dependent:   :destroy
has_many :followers, through: :reverse_relationships, source: :follower

before_save { |user| user.email = email.downcase}
before_save :create_remember_token

validates :name, presence:true, length: { maximum: 50 }

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

def feed
  Micropost.where("user_id =?", id)
end

def following?(other_user)
  relationships.find_by_followed_id(other_user.id)
end

def follow!(other_user)
  relationships.create!(followed_id: other_user.id)
end

def unfollow!(other_user)
  relationships.find_by_followed_id(other_user.id).destroy
end

private
  def create_remember_token
    self.remember_token = SecureRandom.urlsafe_base64
  end

end

这是类本身

class Relationship < ActiveRecord::Base
  attr_accessible :followed_id
  belongs_to :follower, class_name: "User"
  belongs_to :followed, class_name: "User"

  validates :follower_id, presence: true
  validates :followed_id, presence: true
end

这就是本教程中的内容。为了以防万一，我又添加了:follower_id，但它仍然不起作用。

我还构建了一个relationship_controller。

class RelationshipsController < ApplicationController
before_filter :signed_in_user

def create
  @user = User.find(params[:relationship][:follower_id])
  current_user.follow!(@user)
  respond_to do |format|
    format.html { redirect_to @user }
    format.js
  end
end

def destroy
  @user = Relationship.find(params[:id]).followed
  current_user.unfollow!(@user)
  respond_to do |format|
    format.html { redirect_to @user }
    fromat.js
  end
end

结束

在路线上。

 resources :users do
   member do
     get :following, :followers
   end
 end

发生错误的页面如下所示：

<% @user ||= current_user %>
<div class = "stats">
<a href ="<%= following_user_path(@user)%>">
    <strong id="following" class="stat">
        <%= @user.followed_users.count %>
    </strong>
    following
</a>
<a href="<%= followers_user_path(@user) %>">
    <strong id="followers" class="stat">
        <%= @user.followers.count %>
    </strong>
    followers
</a>
</div>

当我删除第二个代码块之前的第一部分代码时，代码的第一部分工作得很好。这只是因为某些原因，“追随者”关系没有建立起来。我在控制台中使用它，但它不能调用，而user.followed_users可以工作。我已经玩了四个小时了，我把桌子弄掉了，然后重建了它，但我不能让它工作。

我之前尝试过查看堆栈溢出，发现如下所示：

Ruby error (uninitialized constant User::Relationship)

但那里的解决方案都没有起到作用。谢谢你的帮助！

Answer 1

你有一个打字错误：

has_many :reverse_relationships, foreign_key: "followed_id",
                                 class_name: "Relationships",

将最后一位更改为class_name: "Relationship"。