Upload image from url using Paperclip

Upload image from url via Paperclip.rb

# Basic Code

class Image
  has_attached_file :attachment
  
  def attachment_url(url)
    require "open-uri"
    self.attachment = open(url)
  end
end

# If you faced memory leakage, I think it is better to do it this way

class Image
  has_attached_file :attachment
  
  def attachment_url(url)
    require "open-uri"
    f = open(url)
    self.attachment = f
    f.close
  end
end

# This way you are making sure that file is closed after it has been utilized
# This will work great unless an exception was thrown. In this case the file won't be closed so better do that

class Image
  has_attached_file :attachment
  
  def attachment_url(url)
    begin
      require "open-uri"
      f = open(url)
      self.attachment = f
    ensure
      f.close if f
    end
  end
end

# This will work fine but you will find that file names are weird and without extension
# so to fix that just add this extra line

class Image
  has_attached_file :attachment
  
  def attachment_url(url)
    begin
      require "open-uri"
      f = open(url)
      def f.original_filename ; base_uri.path.split('/').last ; end
      
      self.attachment = f
    ensure
      f.close if f
    end
  end
end

# This will force usage of the resource name and extension rather than dummy ones used by OpenURI
# If you expect getting urls with spaces and also with Arabic Characters then add this small modification

class Image
  has_attached_file :attachment
  
  def attachment_url(url)
    url = URI.encode( CGI.unescape( url ) )
  
    begin
      require "open-uri"
      f = open(url)
      def f.original_filename ; base_uri.path.split('/').last ; end
      
      self.attachment = f
    ensure
      f.close if f
    end
  end
end

# 1 last Note, I sometimes need to grab too many images and I don't care about non existing ones so I added this modification

class Image
  has_attached_file :attachment
  
  def attachment_url(url)
    begin
      require "open-uri"
      f = open(url)
      def f.original_filename ; base_uri.path.split('/').last ; end
      
      self.attachment = f
    rescue OpenURI::HTTPError => e
      raise(e) unless e.message == "404 Not Found"
    ensure
      f.close if f
    end
  end
end

# This will raise the exception again only if the problem was not "404" due to non-existance of the resource