我们可以使用阿里云的oss来存放我们项目所使用的资源，如用户头像，音频等文件。

1.首先在阿里云的oss创建bucket

bucket设为公共读。

图片.png

2.安装gem

gem 'carrierwave'
gem 'carrierwave-aliyun'

3.配置config/initializers/carrierwave.rb

CarrierWave.configure do |config|

  config.storage = :aliyun
  config.aliyun_access_id = "LTAIsvndsd9GGs1J"
  config.aliyun_access_key = '2UuuxL6NSbjZ9jMufHJObSvmtd0VYK'
  # 你需要在 Aliyum OSS 上面提前创建一个 Bucket
  config.aliyun_bucket = "hpd-ddd"
  # 是否使用内部连接，true - 使用 Aliyun 主机内部局域网的方式访问  false - 外部网络访问
  config.aliyun_internal = false
  # 配置存储的地区数据中心，默认: cn-hangzhou
  config.aliyun_area = "cn-shenzhen"
  # 使用自定义域名，设定此项，carrierwave 返回的 URL 将会用自定义域名
  # 自定义域名请 CNAME 到 you_bucket_name.oss-cn-hangzhou.aliyuncs.com (you_bucket_name 是你的 bucket 的名称)
  config.aliyun_host = "https://hpd-ddd.oss-cn-shenzhen.aliyuncs.com"
  # Bucket 为私有读取请设置 true，默认 false，以便得到的 URL 是能带有 private 空间访问权限的逻辑
  #config.aliyun_private_read = true

end

4.配置app/uploaders/avatar_uploader.rb

class AvatarUploader < CarrierWave::Uploader::Base

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

  # Choose what kind of storage to use for this uploader:
  # 存储的类型是文件
  #storage :file

  storage :aliyun


  # storage :fog

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  # 图片存放的位置
  def store_dir
    if Rails.env.production?
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    else
      "development/uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    end

  end

  # Provide a default URL as a default if there hasn't been a file uploaded:
  def default_url(*args)
    # For Rails 3.1+ asset pipeline compatibility:
    # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
    # "/images/fallback/" + [version_name, "default.png"].compact.join('_')
    "http://hpd-ddd.oss-cn-shenzhen.aliyuncs.com/uploads/app_user/avatar/default_user_icon.png"
  end

  # Process files as they are uploaded:
  # process scale: [200, 300]
  #
  # def scale(width, height)
  #   # do something
  # end

  # Create different versions of your uploaded files:
  # version :thumb do
  #   process resize_to_fit: [50, 50]
  # end

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  # 图片格式接受白名单
  # def extension_whitelist
  #   %w(jpg jpeg gif png)
  # end

  # Override the filename of the uploaded files:
  # # Avoid using model.id or version_name here, see uploader/store.rb for details.
  def filename
    "#{model.id}__#{Time.now.to_i}.#{original_filename.split(".").last}" if original_filename
  end

end

6.设置model

class AppUser < ApplicationRecord

  mount_uploader :avatar, AvatarUploader
 
end

6.存取

存

user = AppUser.new
user.avatar = params[:avatar]
user.save

取

user.avatar.url