File-uploads in rails 2.0.2 + AJAX

rubyonrails-talk
1

hi,

I am porting an app from 1.2.5 to 2.0.2 and I am having problems with file uploads. The form fields look like this:

<%= 'Add attachment'.t %>: <%= file_field 'attachments', "upload#{id}", :size => '40' %>

The old code expects params[:attachments]["upload#{i}"] to be an object (File?) with a method "original_filename". I am using ajax (and previously didn't):

  <% form_remote_tag(:url => url_for(:controller => :mex, :action => :submit_answer, :id => mex_exercise.id), :update => "answer_#{mex_exercise.id}", :html => {:multipart => mex_exercise.num_attachments_allowed > 0}) do %>

(num_attachments_allowed is > 0 and I see the enctype-attribute:   <form action="/en/mex/submit_answer/46" enctype="multipart/form-data" method="post" onsubmit="new Ajax.Updater('answer_46', '/en/mex/submit_answer/46', {asynchronous:true, evalScripts:true, parameters:Form.serialize(this) + '&authenticity_token=' + encodeURIComponent('a5de291b429a9def0d4ff822d8e278172e472a28')}); return false;"><div style="margin: 0pt; padding: 0pt;">)

Do I need to change anything because of ajax?

thanks,

2

File uploads can't be done over ajax (because the javascript isn't allowed to read files from your computer). There are tricks you can play with iframes and so on.

Fred

3

Indeed as another poster has already mentioned you can’t upload files through ajax (javascript security).

Either use a Flash uploader like swfupload.org (but if you’re not fairly fluent in Javascript, i would advise against it), do know that the new session security measures cause problems if you want the upload to be authenticated or search for the responds_to_parent plugin and follow the instructions.

Best regards

Peter De Berdt

4

I also use v2.0.2 and have problem with remote file upload. I followed the instructions from this page http://khamsouk.souvanlasy.com/2007/5/1/ajax-file-uploads-in-rails-using-attachment_fu-and-responds_to_parent and getting error undefined method `content_type' in vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu.rb:260:in `uploaded_data

anybody handled this problem in rails 2 ?

Marek