Just what I needed - thanks!

Paperclip looks like a pretty good alternative to attachment_fu.

Thanks Ryan for that railscast! A few weeks ago I was build a function like this in my app with attachment_fu and ImageScience. Are there any drawbacks in relation to your solution?

Hi Ryan! One question! Is it possible to make Paperclip work if I need my model to have many attachments? If it's not possible, maybe you know some other plugins?

@Alex
Have a look at this tutorial: http://www.practicalecommerce.com/blogs/post/432-Multiple-Attachments-in-Rails

It's for attachment_fu but it's the same concept for paperclip.

Also there is a polymorphic paperclip plugin, see this tutorial
http://burm.net/2008/10/17/ruby-on-rails-polymorphic-paperclip-plugin-tutorial/

As far as I know there is a polymorphic paperclip plugin. Maybe that's what you are looking for, Alex.

I liked paperclip plugin, but I need to sort out what to do with many attachments.

Thanks for the link, Ryan.

It's good to see more people using Paperclip.

I really really want to stress that uploading files is _easy_!

http://gist.github.com/20698

That gist is just a file upload, though. No file size and/or mime type validations there. Or imagemagick fanciness.

Hi Ryan, great post as always. I would like to ask what about pdfs or docs ? Just change the filetype ?

Great presentation Ryan, I choose paperclip some time ago and I'm very happy with it.

I remember that you can use model attributes into url/path using interpolations (great feature !!!).

Really simple and useful screencast once again. +1 to panosjee, I'd love to be able to have multiple pics on the model as well as clip more than just images.

@PanosJee - You can change the file type validations if you want to upload pdfs or docs. Paperclip can handle pretty much anything you want to upload

@Aditya Sanghi - If you want to attach multiple uploads to a model just create an assets model using paperclip and use a has_many relationship

We use paperclip on a current project and it works good except for:

1. When you delete an attachment it does not delete the directory it created for the file. Thus over time you are left with hundreds of empty directories on your server.

2. Take an Outlook email and drag it to your desktop, it'll create a .msg file. Now try to upload that file using a webkit based engine (Chrome, Safari) and Paperclip will crash. No problem with FF or IE.

I've tried to get a solution from Paperclip Google group but the developers have been unresponsive to the second problem and don't think the first problem is a problem.

@Chess:

1. I guess you could set up a rake task that removes the empty directories?

2. They should definitely fix that. Maybe they don't know how...

Why not attachment_fu?

Is this a good solution to use if you have a model that needs to 'has_many' photos? its not clear how you would adapt this to the situation where you need to have a variable number of photos associated with a model.

Thanks for any insight on this.

Hey Ryan

Another good one and again we seem strangely in sync with your railscasts - Rob posted about Paperclip on our blog yesterday - including instructions to help long suffering (in general!) windows users out:

http://thewebfellas.com/blog/2008/11/2/goodbye-attachment_fu-hello-paperclip

Chris

@zachary: there's a plugin on github for polymorphic paperclips. or you can setup polymorphism manually (which is what i did) as i didn't want an additional table in the middle.

Great screencast, Ryan! A small note to add. To refresh the thumbnails after a change in the attachment models, there is no need to upload the images again. You can simply run this --

rake paperclip:refresh

For those wondering how to handle the case where you want many photos per product. All you need to do is create a second model (ProductPhoto) with a one-to-many association to product. Use paperclip on ProductPhoto and there you go. Now a product can have many photos.

@leethal, thanks! It's nice to see file uploads on their own is fairly simple.

@Chess, it's an open source project, so if the developers aren't willing/able to fix these problems you can always fork it on GitHub and fix them. Maybe someone already has as there are a number of forks already.

@Nilesh, cool, didn't know about that Rake task. Thanks! That's one thing, I think Paperclip could use more complete documentation.

This is very cool.

@Jim Neath - sounds like paperclip can handle any file type, great!

Is it possible to store the attachments in the DB? I'd like to store attachments in the database for things like drivers licenses, social security cards, etc.

using windows i always find myself with C:/InstantRails-2.0-win/ruby/bin/mongrel_rails: No such file or directory - iden
tify "C:/DOCUME~1/Owner/LOCALS~1/Temp/stream.2748.0"
 and not being able to covnert to styles small even with imagemagick and rmagick installed in the log file i just saw
Rendering C:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/templates/rescues/layout.erb (not_found)

any idea how can i fix it (switching for linux aint an option right now)
thanks in advance

@Ben,

I used this as a basis for storing some simple pictures in my database:

http://dizzy.co.uk/ruby_on_rails/contents/store-file-uploads-in-database

I wasn't trying to do exactly the same thing as the author, but it wasn't too hard to adapt. Having said that, I'm not sure it is better than the way Paperclip or Attachment_fu does it by default. I can see pros and cons both ways.

@AdrianoD: I switched completely to cygwin and use ruby (on rails) inside there. I think I have less problems with plugins etc. Maybe you should try also.

Here are all the links I needed to set it up: http://delicious.com/lenart/cygwin

I almost fell off the chair with that! Great news! Just what I needed!

Did anyone test if an attacker can concatenate code to the image and have it execute when the image displays?

I almost cried watching this! :) Do you have any idea how long it took me to get attachment_fu working and cropping and ImageScience and RMagick and memory leaks and ImageMagick etc and then you did it in 5 minutes arg!!!!!

Great stuff, thanks Ryan.

awesome, thanks! just what I was looking for to replace attachment_fu, which gives me some headache with kind of restricted validation.

@AdrianoD

I struggled with the same problem but running under passenger. The solution for me was to add the following file to the initializers:-

# config/initializers/paperclip.rb
Paperclip.options[:image_magick_path] = "/usr/local/bin"

Restart the server and voila! (at least for me YMMV!)

Ryan, I love your screencast again. Thanks for all your nice work!

I have one question. I try to save photos on a one to many relationship. It works well only i want to change the path. I want to have a parent_id in the url and the path.

ive got a room and a room has many pictures

This isnt working:

:path => ":rails_root/public/assets/room_photos/#{self.room.id}/:id/:style/:basename.:extension"

:parent_id or :room_id isnt working as well.

Somebody has an idea?

Great RailsCast, but can you explain why use paperclip over attachment_fu? Some comments talked about it briefly but not enough for me to know if it's worth switching my code (from attachment_fu to paperclip).

Thanks,

Andrew

@AdrianoD, Windows is mentioned at the beginning of this article, so that might help.

http://tinyurl.com/5nrl3k

@Thomas, that's an interesting question and I haven't looked into it. I don't think any code would be executed on the server side, but maybe when the client renders it? However, if so then I think this would be a security flaw with the image codec itself and not necessarily with our Rails app.

@Michael, yes that's possible by making a custom interpolation. It's mentioned near the end of this article.

http://tinyurl.com/5nrl3k

@Andrew, if you're using attachment_fu with good success then I wouldn't bother switching. But for new projects I recommend paperclip for these reasons:

- a separate attachment model isn't necessary.
- image library isn't required (unless you need to resize)
- smaller memory footprint

Those are just some things I've heard, but honestly haven't done much research.

@Ryan, for those of us that choose to switch from attachment_fu to paperclip, is there any way to continue to use the separate attachment model?

@James, yep. I'm not sure of all the steps involved. But you can keep your attachment model and just apply paperclip to that.

paperclip is by far the best alternative to attachment_fu....i no longer like attachment_fu, so thank you Ryan.

there is an other very smart plugin for fileuploads called uploadcolumn. i use it on several projects and at first sight it is exact the same thing as paperclip ..

http://uploadcolumn.rubyforge.org/

Thanks Ryan! I love paperclip. I have a suggestion for a future episode...charting/graphing!

I am using Paperclip to upload photographs, and wanted to have the DateTime the photo was taken extracted from the uploaded file's EXIF metadata, and saved as an attribute on my Picture model.

After some hopeless attempts using before_save and after_save callbacks, I ended up just overwriting Paperclip's photo= method: http://pastie.org/310107

And what about width="" height=""?

It would be great to save width and height of resized image in its file name...

Is there a way to upload an image by typing the url of the image location, instead of using the file_field. Ive been looking for a good tutorial for this and cant seem to find any. Thanks

@Steve, take a look at http://almosteffortless.com/2008/10/24/easy-upload-via-url-with-attachment_fu/

That's how you do it with attachment_fu, though – dunno if you can do the same trick using Paperclip.

Steve, Benjamin - checkout the paperclip_url_support project over at github.

Hey guys... thanks for the suggestions... got it to work!!!

Great episode! I set up Paperclip on my local machine (Leopard, running Passenger) and after commenting out the "rescue" in Paperclip::Attachment#post_process, I get this crappy "/tmp/stream.3916.0 is not recognized by the 'identify' command" error.

I have my ImageMagick path set correctly and proper permissions. What gives?

Sorry for asking, but when I run script/plugin install git://github.com/thoughtbot/paperclip.git on windows I only get information: removing: D:/testy/vendor/plugins/paperclip/.git

What should I do to install plugin from git on windows?

easier than has_attachment , for images uploading

Hi Laser Lemon,

the same issue here. Did you fix it already?

when i use git to install paperclip via "script/plugin install git://github.com/thoughtbot/paperclip.git", i get the following error (after which, if i try to use the paperclip generator, it says it doesn't exist)...

http://pastie.org/318325

If you could give me ANY help i would appreciate it. i can't tell if my git install is screwed up, or if i'm missing something. everyone else seems to have an easy time installing this.

Hi Yves, Laser Demon, all,

I got it working with an intializer: http://gist.github.com/26476 - Passenger + Paperclip that is.

via http://www.fuzzylizard.com/archives/2008/07/05/954/

Hey Bryan, as a rails newbi from Germany I love your casts. And with regards to paperclip: my project uses file_column but I would like to switch to paperclip. Do you know how I can make the switch smooth so that I cann still use the so far uploaded Files (path: system/user/picture/<id>/<filename>)? Great if you could help me.
All the best. Im a big fan.
Nick

@Laser Lemon

I am getting the same error on two different machines, a vista and an XP.

I do not have imagemagick installed.

AppData/Local/Temp/stream.2620.0 is not recognized by the 'identify' command.

Solved my issue by installing ImageMagick-6.4.5-8-Q16-windows-dll.exe

Any recommendations against using fleximage? http://github.com/Squeegy/fleximage/wikis

paperclip looks very easy, but so does fleximage. The one thing that really catches my attention about it is the dynamic resizing:
http://github.com/Squeegy/fleximage/wikis/rendering

From what I understand it will render whatever size you want at anytime after the upload, so you don't have to figure out all your sizes in advance and then build your own rake task if you want to make a new size.

Hi @all,

do anyone of you know how to include by paperclip generated thumbnails to the to_xml methode?
If I use methods I can specify an array with fields but there I can't say the variation (e.g. small part of photo).

Any ideas?
Thanks for your help,
Steffen

SPAM CLEANUP ON AISLE 4

For some reason when I used Paperclip to resize images for thumbnails it produced files of 0bytes. I had to specify in the model that I wanted jpg files created even if the original was a jpg.

In the following instance the 'small' picture would be fine, but the 'regular' size would be corrupt.

has_attached_file :photo, :styles => { :small => ["100x100#", :jpg], :regular => "300>"}

I'm using paper clip to upload documents (doc and rtf) it workd fine for a while then it stops suddenly! I can't figure out what's the problem but when I restart my mongrel instance it works fine again... anyone knows anything about it??

Checked my mongrel log and found this: Error reading HTTP body: #<RuntimeError: Socket read returned insufficient data: 10379>

Hi,

thanks Koen Van der Auwera.
Another way for solving this is setting PATH as environment variable for Mac OS X 10.5 in /System/Library/LaunchDaemons/org.apache.httpd.plist:

http://gist.github.com/28112

One more thing… I haven't seen a Fileupload plugin which is capable of keeping the temporar file of an upload if the validation fails.

For instance we've the model Medium which has_attachment :file and validates_presence_of :comment. If we left out the comment but specified a :file (let's say a big one... 200MB...) the validation will fail and the data is lost.
It's pretty annoying if you have to upload the file again.

As a workaround you can reflect the validation on client side... but it's not a solution for the problem.

Yves i'm nearly sure I've done that in the past with attachment_fu. I wanted to use the mp3-info library to extract data from a sound file upload even if the upload failed in validations.

You can use a before_save method in the model to access the file (using self.temp_path) before it has been saved. You can then do anything you want with it.

Or you could write your own validations, or modify the existing ones.

For anyone on OSX getting the ".../tmp/stream.3916.0 is not recognized by the 'identify' command" error, it's probably that identify is not in your path. The macport install and other installs do not always seem to get this right.

To fix:
* check if "identify" is in your path from the same terminal where you're about to run your "ruby server/script" command - just try to run it from the terminal prompt
* if it won't run, try entering these commands:
tom:~ tom$ export MAGICK_HOME="/opt/local/"
tom:~ tom$ export PATH="$MAGICK_HOME/bin:$PATH"
tom:~ tom$ export DYLD_LIBRARY_PATH="$MAGICK_HOME/lib"
(you may have to adjust MAGICK_HOME to match your install)

After that, try running identify again from your RoR site's root dir. It should now work. If it does, run your server and see if your photos now work.

(You'll want to make sure the above PATH changes are made permanent if this fix does help.)

Hello Ryan,

Do you know if it's possible to create an attachment inside a controller?

I mean, I have some text stored in a string. I want to create an attachment that is a plain text file containing the contents of that string into a given model object.

Is this possible?
Thanks!

default_url and default_style are also useful options.
See paperclip.rb in the code for explainations.

Like a bunch of other people on here, I'm setting up a model with multiple attachments.

I've followed this Railscast and Ryan's article on multiple models in one form in Advanced Rails Recipes (#13).

Here's the code I have so far:
http://gist.github.com/33011

As you can see I'm receiving an 'unknown attribute' error. I think this has to do with the way I'm using a new attribute writer method for in the model, and I don't think paperclip has run at that point. So, there is no attachment attribute yet, and thus the error.

Any advice is appreciated.

P.S. I've looked at the other articles mentioned above on polymorphic associations with paperclip, but none of them worked for me.

I was having a heck of a time getting Paperclip to generate thumnails, even though I have working copies of ImageMagick and RMagick installed. My IM was built from source and installed to /usr/local/bin. The solution was to add a line to my development.rb:

Paperclip.options[:image_magick_path] = '/usr/local/bin/'

Hope that helps someone else out!

For anyone who's interested I've updated a gist with a working example of multiple file attachments using Paperclip.

http://gist.github.com/33011

Notes about the gist:
1. Page has many Assets
2. Asset has Paperclip attachment
3. Paperclip attachment is called 'file'

no one has any info about: Error reading HTTP body: #<RuntimeError: Socket read returned insufficient data: 10379>??

@Chess, in regards to deleting the folders, when I use 'has_many :photos, :dependent => :destroy' in my model that deletes the photos as well as the folders that contain them.

Thanks for the great post!

I just have a question...I need to upload excel sheets and delete them once i save the data in them onto the database.
I am stuck at the deletion part of it.

I am trying to use Paperclip with a form_remote_for (ajax form) .. but it seems to not recognize the associated form field as being related to the paperclip generated fields.

i.e. I am using <%= form.file_field :pdf %>

and when I submit, I get a message indicating the Pdf must be set - as if it isn't being sent. I can verify it is in the params in the log and that the form is using multipart=>true

Are there known issues or extra steps I must take to get Paperclip to work with a remote form (ajax)?

Thanks - great railscast and plugin!

@Chess: deleting the object destroys the attachment as well as the folder structure. Only the public/<modelname> remains.
The id/style/style.extn gets deleted.

Hi Ryan,

I'm pretty new to Rails at this point, and your screencasts have been an amazing resource, so first and foremost - Thank you!

I was able to get image uploads working, but my question is this: at some point in the life of my application, what is going to happen if (obviously a big "if," but it's what I'm hoping for) I am hosting enough files that I reach the 32,000 sub-directory limit? Is there a simple solution to this problem (if it is in fact a problem)?

Thanks so much!

nice video!!!!

Hi Ryan,
I found that if you edit a product that have an image, if you save it without upload a new one, the first image is lost. Is this a bug of paperclip?

Thanks!

In response to Alex... A good tip, if you have not already thought of this or ruled it out for your specific needs, is to come up with a unique file naming convention to reduce the amount folders needed for categorization. I did some part time work with an image host and they used date-stamping in the file name along with a few other key words to avoid requiring folders. I believe they were hosting around 25k files, so this might still be small scale in comparison if what you may need.

I found a really cool method for automatically unsharpening generated thumbnails when uploading them through Paperclip. If you've ever been bothered about the fuzziness in your generated thumbnails, you should check this out:

http://natemiller.org/2009/2/28/automatically-unsharpening-thumbnails-with-rails-and-paperclip

@John, I've had the same problem as you, i.e. trying to make paperclip work with RJS & AJAX, and getting the "photo must be set" error.. Apparently, It's got something to do with AJAX not being able to read the local file system... I will continue to investigate, and would really appreciate if anyone else with a solution could post it here...

Cheers

Is there any prospect of paperclip integrating an upload progress meter?

Hi . . i m facing a problem. when i write has_attached_file in my model .. i get an error on running the server that undefined method has_attached_file ,,, please help me solving this problem. i need it urgently... please.. i m using windows , netbeans and have installed paperclip as a gem because it is not available as a plugin,,

Somewhere read that :command_path should be used instead of :image_magick_path when setting path of imagemagick, as the later will be deprecated. And when using macport's ImageMagick, /opt/local/bin must be used as the value. Something like this:
Paperclip.options[:command_path] = "/opt/local/bin"

If you're using Windows and you're getting the "not recognized by the 'identify' command." error, here's a solution: http://blog.jonathanhinson.com/2009/04/27/getting-paperclip-working-in-windows/

General tip: For the plugin installation command to work in the command line, be sure you've got git installed. Otherwise, the command fails silently.

I got stuck on this for ages.

There seems to be a bug where the validations ignore :if or :unless parameters.

Here is the reported bug and a patch.

https://thoughtbot.lighthouseapp.com/projects/8794/tickets/131-validates_attachment_presence-should_validate_attachment_presence-should-take-if-and-unless-options#ticket-131-1

I downloaded the episode's code from Ryan's Github account however as soon as I initialize the server and go to localhost:3000 I get this error:
"uninitialized constant ApplicationController"

The Application.rb is where it's supposed to be and has the content as written by Ryan. Any ideas as to what's going on? Any help is welcomed. Thanks everyone.

@AcaKaliman

application.rb has since been renamed application_controller.rb. Rename this file and try it again. It was successful for me.

@Steffen

I wrote a blog post about paperclip and to_xml here:

http://www.mrkris.com/2009/06/18/paperclip-resized-image-details-in-to_xml/

If you need multiple photos for your object, I recommend this well written tutorial:

http://www.webyfi.com/?p=11

Read the comments as well, there are a few hints that might help you thru.

To those wanting "ajaxy" file uploads, look into the iframe remoting pattern. There are some articles on iframe remoting and attachment_fu that will work just as well for paperclip.

Hey,

I installed paperclip, but cannot create a migration for it. I try this:

script/generate paperclip user avatar

And get a long string of errors, starting with this:

/opt/local/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:376:in `new_constants_in': You have a nil object when you didn't expect it! (NoMethodError)
You might have expected an instance of Array.
The error occurred while evaluating nil.empty?
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:202:in `load_file'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:94:in `require_or_load'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:248:in `load_missing_constant'
from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:453:in `const_missing'
from /projects/Vitae/vendor/plugins/paperclip.git/lib/paperclip.rb:113:in `included'

Any ideas? I can't find anyone else who's had this problem.

Never mind, got it fixed :)

Hi...I am getting the following error while trying to upload a jpg file using paperclip.

identify: no decode delegate for this image format `I:/temp/stream.2652.2' @ constitute.c/ReadImage/503.

Can somebody help me with this?

Hello Ryan,

While uploading a file, I also need to scan whether the uploaded file is a virus or not. Can you please tell me how to do it?

Thanks,
Madan Kumar Rajan

Crikey - could it be any harder to install ImageMagick on OS X?! I downloaded the binary release and got it working easily, but I can't get the rmagick gem to see it at all. Frustrating!

Thanks for the great scrn cast Ryan!
Is there any attachments content type white list? Users should not be able to upload malicious files like .exe

Anyway to check uploaded files for viruses?

Hi guys,

I'm a newbie.

I get the following error when I reload the form after installing paperclip:

NoMethodError (undefined method `has_attached_file' for #<Class:0xb7ae3140>):
  app/models/product.rb:4
  app/controllers/products_controller.rb:3:in `index'

Please help.

Hi im one of those noobies that cant get paperclip to create thumbs in windows, the eviroment path is set up and all. i digged inside the gem code and sustituded the this line
success = system(command.gsub(/\s+/, " "))
with this one
success = system("notepad")

just wanted to see if the code was able to pass any command to de shell and nothing happened.

is this a wrong way to verify whats going on inside the gem? is there a better why?

paper clip silently fails to generate the thumbs, nothing is shown in the logs and there is no complaing with whiny_thumbnails set to true

I have the problem that we use 'attachment_fu' in one of our projects. There is a class named 'Attachment' and this is associated to different models. e.g. StaticPage has_many attachments.

Now I want to add paperclip too and run into a name-conflict.

StaticPage.attachments...... doesn't work since paperclip is installed and brings up errors like:

undefined method `quoted_table_name' for Paperclip::Attachment:Class

StaticPage doesn't use paperclip at all and it's just the presence of Paperclip causes this errors.

I wonder if there is a way to 'rename'/'refactoring' the used 'Attachment-Model' to something like 'BinaryAttachment' throughout the entire project. of course RexEx through the project would be work - but I'm not a RegEx-specialist and therefore I'm looking for a more simpler way to do this.

Does anyone know about a refactoring tool like XCode has to rename Classes? Or how would you solve this?

@Andi
I ran into the same namespace issue with my own attachments join table. I just set-up my asset association like this and it seems to work fine:

has_many :attachments, :class_name => '::Attachment', :as => :from, :dependent => :destroy

The key here being the class name.

Hi, for those who have still problem with paperclip on windows and are still getting error:
"not recognized by the 'identify' command." and the solution: http://blog.jonathanhinson.com/2009/04/27/getting-paperclip-working-in-windows/ does not work:

I've reinstalled ruby with "http://rubyforge.org/frs/download.php/66871/rubyinstaller-1.8.6-p383-rc1.exe", uninstall imagemagick and install imagemagick 6.5.8-6 q16 and nothing more and it works! No more errors.
Hope it helps..

H.

Hello,
I get this error message every time i try upload am image.
NB: Foto is BD column name.
There were problems with the following fields:
    * Foto /tmp/stream20091228-2242-xptimu-0 is not recognized by the 'identify' command.
    * Foto /tmp/stream20091228-2242-xptimu-0 is not recognized by the 'identify' command.

Can you help me? thanks in advance

@Narcisse

I am having the save problem, have tried everything i know, but no luck

please help us!

If you run into "is not recognized by the 'identify' command"

delete imagemagick and reinstall via macports

sudo port install ImageMagick

Anyone have experience with conditional validations in paperclip?

In my case, an image is optional, but if it's present, I want to validate its size and format.

Any ideas or code?

@graham:
For 'validates_attachment_content_type', you can add :allow_nil => true. For 'validates_attachment_size', you can use :allow_nil => true after a quick fix as follows:

Open your paperclip.rb plugin file.
Find 'def validates_attachment_size name' string.
Replace 'validates_inclusion_of' rows with the following:

validates_inclusion_of :"#{name}_file_size", options.merge(:in => range, :message => message)

Save it. Restart your server. Try again. Let me know if this works. Good luck.

When uploading an image, the exif data stored on the file may produce unintended results. IE... digital cameras store the rotation/orientation of images in the file. Mac OS reads this data, and automatically rotates the image locally (and the image appears to be oriented correctly). However, after uploading, imagemagick ignores the rotation/orientation information in the photo, causing an undesired 90 degree rotation. Keep in mind, that this only happens on unprocessed images. Anywho.... I was tearing my hair out on this, and saving a copy of the image in photoshop seemed to fix the problem.

Nice vid! Thank you!!

Nice vid! Thank you!!

did anyone figure out how to use paperclip to attach files in ajax forms (form_remote_tag/form_remote_for)? this seems like a big limitation to me.
what are the workarounds?

great tutorial ryan!

thanks

vinod have a look there http://khamsouk.souvanlasy.com/articles/ajax_file_uploads_in_rails_using_attachment_fu_and_responds_to_parent

I have a question too, is there a way with paperclip to convert png and gif files' alpha channel to a white background?