未初始化的常量ApplicationRecord [英] uninitialized constant ApplicationRecord
问题描述
我正在在线学习Rails教程，当我访问 http://localhost时，出现以下错误消息: 3000/
I am working on the rails tutorial book online and I am getting the following error message when I go to http://localhost:3000/
未初始化的常量ApplicationRecord"
"uninitialized constant ApplicationRecord"
，它为我提供了以下代码，突出显示了第一行.
and it gives me the following code highlighting the first line.
class User < ApplicationRecord
attr_accessor :remember_token
before_save { self.email = email.downcase }
validates :name, presence: true, length: { maximum: 50 }
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
validates :email, presence: true, length: { maximum: 255 },
这是我的application.html.erb文件:
Here is my application.html.erb file:
<!DOCTYPE html>
<html>
<head>
<title><%= full_title(yield(:title)) %></title>
<%= stylesheet_link_tag "application", media: "all",
"data-turbolinks-track" => true %>
<%= javascript_include_tag "application", "data-turbolinks-track" => true %>
<%= csrf_meta_tags %>
<%= render 'layouts/shim' %>
</head>
<body>
<%= render 'layouts/header' %>
<div class="container">
<% flash.each do |message_type, message| %>
<div class="alert alert-<%= message_type %>"><%= message %></div>
<% end %>
<%= yield %>
<%= render 'layouts/footer' %>
<%= debug(params) if Rails.env.development? %>
</div>
</body>
</html>
还有我的user.rb文件:
And my user.rb file :
class User < ApplicationRecord
attr_accessor :remember_token
before_save { self.email = email.downcase }
validates :name, presence: true, length: { maximum: 50 }
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
validates :email, presence: true, length: { maximum: 255 },
format: { with: VALID_EMAIL_REGEX },
uniqueness: { case_sensitive: false }
has_secure_password
validates :password, presence: true, length: { minimum: 6 }
# Returns the hash digest of the given string.
def User.digest(string)
cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
BCrypt::Engine.cost
BCrypt::Password.create(string, cost: cost)
end
# Returns a random token.
def User.new_token
SecureRandom.urlsafe_base64
end
# Remembers a user in the database for use in persistent sessions.
def remember
self.remember_token = User.new_token
update_attribute(:remember_digest, User.digest(remember_token))
end
# Returns true if the given token matches the digest.
def authenticated?(remember_token)
return false if remember_digest.nil?
BCrypt::Password.new(remember_digest).is_password?(remember_token)
end
# Forgets a user.
def forget
update_attribute(:remember_digest, nil)
end
end
推荐答案
您似乎正在使用Rails 5教程，但是正在使用Rails4.在Rails 5中，所有模型都继承自ApplicationRecord，而Rails 4则继承自ApplicationRecord. c4>
It appears you're using the Rails 5 tutorial, but working with Rails 4. In Rails 5 all models inherit from ApplicationRecord, while Rails 4 from ActiveRecord::Base
立即修复:
class User < ActiveRecord::Base
...
end
长期修复，切换到Rails 5并学习Rails 5
Long term fix, switch to Rails 5 and learn with Rails 5
这篇关于未初始化的常量ApplicationRecord的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
