Question

我尝试在app / uploader中添加Picture Uploader但是在加载我的应用时出现此错误：

uninitialized constant Car::PictureUploader on line 3 of car.rb

应用/模型/ car.rb

class Car < ActiveRecord::Base
  belongs_to :user
  mount_uploader :picture, PictureUploader
  validates :user_id, presence: true
  validates :year, presence:true, length: { maximum: 4 }
  validates :brand, presence:true

应用/上传/ picture_uploader.rb

class PictureUploader < CarrierWave::Uploader::Base
  storage :file

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  # Add a white list of extensions which are allowed to be uploaded.
  def extension_white_list
    %w(jpg jpeg gif png)
  end
end

在相当于picture_uploader.rb的文件没有在正确的文件夹中之前我已经收到此错误，但我认为这里的一切都是正常的。当我在user.rb中注释第3行时，页面加载。关于如何让我的页面运行的任何想法？

Answer 1

有同样的错误，不得不手动终止服务器进程：

ps aux | grep server
kill [server process id]

出于某种原因，之前使用Ctrl + C关闭服务器似乎没有用。

Answer 2

我想你想要：

::PictureUploader

其中指定它只是类PictureUploader而不是命名空间PictureUploader中的类Car。

Answer 3

只需重新启动服务器即可。它将解决此问题。在您的代码中一切正常。

未初始化的常量Car :: PictureUploader

3 个答案: