ruby-on-rails - Rails carrierwave default_url不起作用

我认为即时通讯无法正确理解，但是如何为用户提供默认图片？

   def default_url
      "/images/fallback/" + [version_name, "default.png"].compact.join('_')
   end

我的images/fallback目录中有一个名为“default.png”的图像。我在网上看到的人们也将version_name更改为“tiny”之类的东西，但这似乎也不适合我。这是怎么回事？版本名称究竟是什么？

我尝试过类似的东西

   def default_url
      "/images/fallback/default.png"
   end

但这也不起作用。我有什么误会？
谢谢!

编辑:

class ImageUploader < CarrierWave::Uploader::Base

  # Include RMagick or MiniMagick support:
  include CarrierWave::RMagick

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  # Provide a default URL as a default if there hasn't been a file uploaded:
   def default_url
      ???????
   end

  # Create different versions of your uploaded files:
   version :thumb do
     process :resize_to_fill => [80, 80]
   end

end





class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :name, :email, :password, :password_confirmation,
     :remember_me, :image, :remote_image_url, :image_cache

  mount_uploader :image, ImageUploader
end

最佳答案

例如，您有这样的上传器:

class MyUploader < CarrierWave::Uploader::Base

  version :thumb do
    process resize_to_fill: [280, 280]
  end

  version :small_thumb, :from_version => :thumb do
    process resize_to_fill: [20, 20]
  end

   def default_url
      "/images/fallback/" + [version_name, "default.png"].compact.join('_')
   end
end

/images/fallback/default.png代表原始图像，small_thumb版本路径为/images/fallback/small_thumb_default.png，依此类推。

如果需要处理后图像实际保存的路径，则需要store_dir

  def store_dir
    'public/my/upload/directory'
  end

关于ruby-on-rails - Rails carrierwave default_url不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10100529/