未初始化的常量 User::follow 提取的源代码（大约第 28 行）：

Question

我的 user.rb 模型有一个错误（大约第 28 行）：

27def following?(user) 
28 following.include?(user)
29end

知道我在这里做错了什么吗？显示 C:/instagramm/instagram-clone/app/views/accounts/profile.html.erb 第 11 行出现的位置：我的个人资料。html.erb :

<% if @users.image.present %>
<%= image_tag @users.image %>
<% end %>


<strong><h1><%= @users.full_name %></h1></strong>

<% if user_signed_in? && @user == current_user %>

      <%= link_to"Edit Profile", edit_user_registration_path(@user) %>
    <% if current_user.following?(@user) %>
        <%= link_to"Unfollow", follows_path(user_id: @user.id), method: :delete %>
    <% else %>
        <%= link_to"Follow", follows_path(user_id: @user.id) %>
    <% end %>
<% end %>


<div> <%= @users.posts.count %> Posts </div>




<p><%= @users.full_name %></p>
<p><%= @users.description %></p>
<p><%= link_to 'User Website', @users.website if @users.website.present? %></p>



<%= @posts.each do |post|%>
<%= image_tag post.image %>
<% end %>

我的模特：follow.rb

class Follow < ApplicationRecord
    
    

    belongs_to :follower, class_name: 'user'
    belongs_to :followed, class_name: 'user'

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

这是我的 user.rb 模型：错误在 def 中的（#line28）附近？（用户）

class User < ApplicationRecord

  has_many :posts 
  validates :username, presence: true 
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :validatable

has_one_attached :image

has_many :active_follows, class_name: "follow", foreign_key: "follower_id", dependent: :destroy 

has_many :passive_follows, class_name: "follow", foreign_key: "followed_id", dependent: :destroy

has_many :following, through: :active_follows, source: :followed
has_many :followers, through: :passive_follows, source: :follower

def follow(user)
  active_follows.create(followed_id: user.id)
end

def unfollow(user)
  active_follows.find_by(followed_id: user.id).destroy 
end

def following?(user)
following.include?(user)
end 

def full_name
  "#{first_name} #{last_name}"
end



end

Answer 1

Rails 假定关联指向具有匹配名称的 class，因此在这种情况下，您的 following 关联将搜索 Following class。

显然这不是您在这里需要的 - 通过您期望的代码结构快速猜测 following 到 return 一组用户，因此您需要将其告知您的协会:

has_many :following, through: :active_follows, source: :followed, class_name: 'User'

使用给 class_name 选项的正确 class 名称也很重要。它必须与 ActiveRecord 的名称 class 完全匹配，因此它必须是 "Follow" 而不是 "follow"，同样地，"User" 而不是 "user"

Answer 2

您已经收到@BroiStase 的回复，您在代码中使用了不正确的类名称。请更改您的 Follow.rb

class Follow < ApplicationRecord
    belongs_to :follower, class_name: 'User'
    belongs_to :followed, class_name: 'User'
    validates :follower_id, presence: true
    validates :followed_id, presence: true
end

在您的 User.rb 中，您必须进行以下更改。

class User < ApplicationRecord
  has_many :posts 
  validates :username, presence: true 
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :validatable
  has_one_attached :image
  has_many :active_follows, class_name: "Follow", foreign_key: "follower_id", dependent: :destroy 
  has_many :passive_follows, class_name: "Follow", foreign_key: "followed_id", dependent: :destroy
  has_many :following, through: :active_follows, source: :followed
  has_many :followers, through: :passive_follows, source: :follower

  def follow(user)
    active_follows.create(followed_id: user.id)
  end

  def unfollow(user)
    active_follows.find_by(followed_id: user.id).destroy 
  end

  def following?(user)
    following.include?(user)
  end 

  def full_name
    "#{first_name} #{last_name}"
  end
end

请在编写代码时避免任何额外的 spaces、换行符并适当缩进 2 space 以帮助您更好地理解代码。如果仍然出错，请也分享错误消息。

未初始化的常量 User::follow 提取的源代码（大约第 28 行）：

uninitialized constant User::follow Extracted source (around line #28):

html

ruby

ruby-on-rails

erb

ruby-on-rails-6