Re: [Rails] Can't change "filename" attr "after" Create (attachment_fu)

Use Paperclip. It much more faster and powerful gem for attachments.

And take a look at Paperclip Processors
Paperclip could use custom processors to do non-standard stuff with
attachments. By default it's just resizing images with given
parameters.

You specify your processor name like:

has_attached_file :file,
:styles => {:original => {:processors => [:file_renamer]}}

and you need to have a class in
lib/paperclip_processors/file_renamer.rb like

module Paperclip
class FileRenamer < Paperclip::Processor
...
end
end

there's some examples in documentation. The thing is you get an
uploaded @file in your processor, and in the end you need to return
your renamed @new_file back. You could do anything with it inside and
then use another processor in chain.

Like in your case, you can create some tmp_dir, copy the @file.path to
your tmp_dir/new_file_name.ext, and return @new_file =
File.open(tmp_dir/new_file_name.ext). Then you just delete tmp_dir
with after_create filter or with cron job.

On Sat, May 8, 2010 at 3:56 AM, Corey Murphy <lists@ruby-forum.com> wrote:
> I know how to change a filename during the upload process using
> attachment_fu, however I need to change it after the create based on
> additional information I don't have during the initial upload.
>
> Performing an attribute update on the resulting model object always
> seems to ignore the "filename" attribute, but will happily update an
> other attribute of the record.  What gives?  Is it because the record's
> filename is tied to a physical file?
>
> Code:
>
> params[:media_file] is the ":uploaded_data" submitted by a form to the
> controller.
> @media_file = MediaFile.new(params[:media_file])
> if @media_file.save
>  @media_file.update_attributes({:desc => "blah", :filename =>
> "new_fname.ext"})
> end
>
> logger shows the "desc" attribute being updated but never the filename
> attribute.
>
> What gives and how can I make this happen?
> --
> Posted via http://www.ruby-forum.com/.
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