问题描述:

I have a rake file, that reads content via HTTP and I want to use Paperclip to store the loaded content on Amazon S3. It works fine when I provide a local file, but I would like to set the content as a string and set the content type manually.

The following does not work. No error is issued, the database entry is updated, but no file is created in S3:

p.attachment = "Test"

p.attachment_file_name = "test.txt"

p.attachment_content_type = "text/plain"

p.attachment_file_size = "Test".size

p.attachment_updated_at = Time.now

p.save

I guess I could write a temporary file with my content, but that would be a pretty inefficient solution.

网友答案:

No, you have to create a file with your string.

Just look at the Paperclip source code : https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/attachment.rb#L77 and https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/iostream.rb#L5

when you assign something using my_model.attachment=, Paperclip wants a file object.

网友答案:

To avoid littering the filesystem with temp files, you can use StringIO as in:

p.attachment = StringIO.new(your_string)
网友答案:

It's a bit late but I pulled it off by creating a Tempfile using ruby 1.9.2 rails 3.1

file = Tempfile.new( ["file_name", '.txt'] )
file.write( "my test string".force_encoding('utf-8') )
p.attachment = file
网友答案:

For both paperclip and carierwave I end up creating a class like this. It has both methods needed to mock a file upload which they like to see.

class FakeFileIO < StringIO
  attr_reader :original_filename
  attr_reader :path

  def initialize(filename, content)
    super(content)
    @original_filename = File.basename(filename)
    @path = File.path(filename)
  end
end

Works like a dream

网友答案:

Similar to Aarons but with the proper block method as suggested by Ruby:

...one should always call unlink or close in an ensure block.

file = Tempfile.new('test.txt')

begin
  file.write( "Test" )

  p.attachment = file
  p.save              

  # Whatever else you might need to do with the TempFile.

ensure
  file.close
  file.unlink   # Deletes the temp file.
end
相关阅读:
Top