Rails：未初始化的常量 PostsController::TextPost

Question

在我的应用程序中，人们可以发布不同类型的帖子。所以我想到了合并 单表继承为此：

class Post < ActiveRecord::Base
  has_many :comments
end

class TextPostValidator < ActiveModel::Validator
  def validate(record)
    if record.title.nil? and record.body.nil?
      record.errors[:base] << "Either title or body is necessary"
    end
  end
end

class TextPost < Post
  validates_with TextPostValidator
end

class ImagePost < Post
  validates :image_url, :presence => true
end

class VideoPost < Post
  validates :video_code, :presence => true
  validates :video_service, :presence => true
end

class LinkPost < Post
  validates :link_url, :presence => true
end

当我现在在我的 PostsController 中执行此操作时：

def new_text
  @post = TextPost.new
end

def new_image
  @post = ImagePost.new
end

def new_video
  @post = VideoPost.new
end

def new_link
  @post = LinkPost.new
end

我收到此错误：

uninitialized constant PostsController::TextPost

看来我对 Rails 的内部工作原理了解不够，无法找出原因。

添加 从 rails 控制台：

irb(main):009:0* ActiveRecord::Base.subclasses
=> [Post(id: integer, title: string, body: text, video_service: string, video_code: string, image_url: string, link_url: string, ooc: boolean, nsfw: boolean, allow_comment: boolean, type: string, created_at: datetime, updated_at: datetime),
TextPost(id: integer, title: string, body: text, video_service: string, video_code: string, image_url: string, link_url: string, ooc: boolean, nsfw: boolean, allow_comment: boolean, type: string, created_at: datetime, updated_at: datetime),
ImagePost(id: integer, title: string, body: text, video_service: string, video_code: string, image_url: string, link_url: string, ooc: boolean, nsfw: boolean, allow_comment: boolean, type: string, created_at: datetime, updated_at: datetime),
VideoPost(id: integer, title: string, body: text, video_service: string, video_code: string, image_url: string, link_url: string, ooc: boolean, nsfw: boolean, allow_comment: boolean, type: string, created_at: datetime, updated_at: datetime)
LinkPost(id: integer, title: string, body: text, video_service: string, video_code: string, image_url: string, link_url: string, ooc: boolean, nsfw: boolean, allow_comment: boolean, type: string, created_at: datetime, updated_at: datetime)]

看起来没问题。

Answer 1

未初始化的常量错误属于路由错误。尝试转到routes.rb 文件并提供单数和复数资源。

资源：帖子
和
资源：帖子

Answer 2

来自： http://www.hackido.com/2009 /03/quick-tip-solve-uninitialized-constant.html

“事实证明，在最新版本的 Ruby on Rails 带来的主要变化中，有一些其中之一是应用程序控制器不再称为 application.rb 现在它被称为 application_controller.rb

实际上，要解决此问题，只需重命名该文件即可。在下面，运行：”

rakerails:update