使用大小小于10kb的开放URI和回形针存储图像

Question

我想从旧网站导入一些图标.这些图标的大小小于10kb.因此,当我尝试将图标导入其返回的stringio.txt文件时.

require "open-uri"
class Category < ActiveRecord::Base
   has_attached_file :icon,  :path => ":rails_root/public/:attachment/:id/:style/:basename.:extension"
  def icon_from_url(url)
    self.icon = open(url)
   end    
end

在rake任务中.

   category = Category.new
   category.icon_from_url "https://xyz.com/images/dog.png"
   category.save

Answer 1

尝试:

def icon_from_url(url)
  extname = File.extname(url)
  basename = File.basename(url, extname)

  file = Tempfile.new([basename, extname])
  file.binmode

  open(URI.parse(url)) do |data|  
    file.write data.read
  end

  file.rewind

  self.icon = file
end

Answer 2

要覆盖Paperclip中的"假文件上载"的默认文件名(stringio.txt在小文件上或在较大文件上几乎随机的临时名称),您有两种主要可能性:

original_filename在IO上定义一个:

def icon_from_url(url)
  io = open(url)
  io.original_filename = "foo.png"
  self.icon = io
end

您还可以从URI获取文件名:

io.original_filename = File.basename(URI.parse(url).path)

或者替换:basename你的:path:

has_attached_file :icon, :path => ":rails_root/public/:attachment/:id/:style/foo.png", :url => "/:attachment/:id/:style/foo.png"

记得总是改变:url你改变的时候:path,否则icon.url方法会出错.

您还可以定义自己的自定义插值(例如:rails_root/public/:whatever).