Rails, PaperClip, S3, Heroku: Model icon fields not being saved - ruby-on-rails

Question

I am using Rails 3.2 + Heroku + S3 + Paperclip to store an icon on my User model. The model is not saving the 4 icon fields though. The images are getting processed and saved on S3 correctly and no errors are occurring. I also have another model that has a document being stored via Paperclip and S3. That model works perfectly in all cases. The User icon works locally but not on Heroku.
production.rb relevant configuration
config.paperclip_defaults = {
:storage => :s3,
:s3_credentials => {
:bucket => ENV['AWS_BUCKET'],
:access_key_id => ENV['AWS_ACCESS_KEY_ID'],
:secret_access_key => ENV['AWS_SECRET_ACCESS_KEY']
}
}
User model code:
class User < ActiveRecord::Base
attr_accessible :icon
has_attached_file :icon, :url => "/system/:rails_env/:attachment/:style/:hash.:extension",
:hash_data => ":class/:attachment/:id",
:hash_secret => "superSecretThing",
:styles => { :medium => "300x300>", :thumb => "100x100>" },
:default_url => "/blank.png"
...
Controller code: (This code is kind of crazy because I am AJAXing files Base64 encoded.)
params[:user][:icon_data]
decoded_file = Base64.decode64(data)
begin
split_name = params[:user][:icon_file_name].split(".")
file = Tempfile.new([split_name[0..-2].join("."), ".#{split_name[-1]}"])
file.binmode
file.write(decoded_file)
file.close
#user.icon = open(file)
#user.icon_file_name = params[:user][:icon_file_name]
ensure
file.unlink
end
#user.save
I do an almost identical process on another model with a Paperclip attachment and it works flawlessly. In both cases the attachment is being saved correctly to S3 and no errors are being raised. This gist has example output for a controller action from the Heroku logs.
I am pretty baffled because the other model works fine. The only real difference is that the User attachment does image processing but that part appears to be working fine.
The problem is the same as this one, but the solution there does not apply.
Thoughts?

Answer 1

So the problem is that not including the :path argument makes it try to use the :url parameter for both the url and the path. The real fix is to include the :path parameter in addition to the url.
So for example a fixed configuration that works both locally and on Heroku:
has_attached_file :icon,
:url => "/system/:rails_env/:attachment/:style/:hash.:extension",
:path => "public/system/:rails_env/:attachment/:style/:hash.:extension",
:hash_data => ":class/:attachment/:id",
:hash_secret => "superDuperSecret",
:styles => { :medium => "300x300>", :thumb => "100x100>" },
:default_url => "/blank.png"