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Image storage using an open URI and a clip with a size of less than 10 KB

I want to import some icons from my old site. The size of these icons is less than 10 KB. Therefore, when I try to import the icons into the returned stringio.txt file.

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

In the raking task.

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

Try:

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
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To override the default file name “fake file download” in a folder ( stringio.txtfor small files or an almost random temporary name in large files), you have two main options:

Define original_filenameon IO:

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

URI:

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

:basename :path:

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

:url :path, icon.url .

(, :rails_root/public/:whatever).

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, , uri, .

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(URI.parse(url))
  end    
end

,

+1

In the past, I have found the most reliable way to retrieve deleted files using the "wget" command line tool. The following code is basically copied directly from an existing application (Rails 2.x) with a few tweaks according to your code examples:

class CategoryIconImporter
  def self.download_to_tempfile (url)
    system(wget_download_command_for(url))
    @@tempfile.path
  end

  def self.clear_tempfile
    @@tempfile.delete if @@tempfile && @@tempfile.path && File.exist?(@@tempfile.path)
    @@tempfile = nil
  end

  def self.set_wget
    # used for retrieval in NrlImage (and in future from other sies?)
    if !@@wget
      stdin, stdout, stderr = Open3.popen3('which wget')
      @@wget = stdout.gets
      @@wget ||= '/usr/local/bin/wget'
      @@wget.strip!
    end
  end
  def self.wget_download_command_for (url)
    set_wget
    @@tempfile = Tempfile.new url.sub(/\?.+$/, '').split(/[\/\\]/).last
    command = [ @@wget ]
    command << '-q'
    if url =~ /^https/
      command << '--secure-protocol=auto'
      command << '--no-check-certificate'
    end
    command << '-O'
    command << @@tempfile.path
    command << url
    command.join(' ')
  end

  def self.import_from_url (category_params, url)
    clear_tempfile

    filename = url.sub(/\?.+$/, '').split(/[\/\\]/).last
    found = MIME::Types.type_for(filename)
    content_type = !found.empty? ? found.first.content_type : nil

    download_to_tempfile url

    nicer_path = RAILS_ROOT + '/tmp/' + filename
    File.copy @@tempfile.path, nicer_path

    Category.create(category_params.merge({:icon => ActionController::TestUploadedFile.new(nicer_path, content_type, true)}))
  end
end

The logic of rake tasks may look like this:

[
  ['Cat', 'cat'],
  ['Dog', 'dog'],
].each do |name, icon|
  CategoryIconImporter.import_from_url {:name => name}, "https://xyz.com/images/#{icon}.png"
end

This uses the gem type gem to detect the content type:

gem 'mime-types', :require => 'mime/types'
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