ruby-on-rails - 如何使用载波从外部将文件保存到模型？

Question

我有模型:

class RealtyPhoto < ActiveRecord::Base
  attr_accessible :name, :photo

  mount_uploader :photo, RealtyPhotoUploader

  belongs_to :realty_object
end

和上传者:

class RealtyPhotoUploader < CarrierWave::Uploader::Base

  include CarrierWave::RMagick

  storage :file

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

  def default_url
    [version_name, "/assets/default-flat.jpg"].compact.join('_')
  end

  def extension_white_list
    %w(jpg jpeg gif png)
  end
end

我在代码中这样写:

require 'open-uri'

object = RealtyObject.last

photo = RealtyPhoto.new

photo.photo = open('http://milushov.ru/bg.jpg').read

object.realty_photos << photo

我在该行收到一个错误:

 photo.photo = open('http://milushov.ru/bg.jpg').read
ArgumentError: string contains null byte
from /home/roma/.rvm/gems/ruby-1.9.3-p327@miel/gems/carrierwave-0.7.1/lib/carrierwave/sanitized_file.rb:113:in `expand_path'

有人知道如何从外部下载和保存文件吗？ (当我从页面上的表单保存文件时 - 一切正常)。也许使用 CarrierWave uploader ？

Answer 1

Carrierwave 在您的案例中使用 remote_column_name_url 从远程 url 上传图像photo.remote_photo_url = "url"