I know there are tons of questions about paperclip, but I failed to find the answer to my problem.

I know its prob just something simple, but I I'm running out of hair to pull out.

I have paperclip working on other parts of my project, they work with no problem, however, a certain scaffold fails to upload, all the attributes to the uploaded file are nil.

Here are the relevant information.

Model:

  has_attached_file :foo,
                    :styles => { :thumb => "140x140>" },
                    :url  => "/data/:id/:style/:basename.:extension",
                    :path => ":rails_root/public/data/:id/:style/:basename.:extension"

View:

<% form_for(@bar, :html => { :multipart => true }) do |f| %>
    <%= f.error_messages %>
    ----------
    <li><%= f.label :top %>
    <%= f.file_field :foo %></li>
    ----------
    <ul><%= f.submit "Save" %></ul>
<% end %>

Also, comparing the logs to the parts that work, the :foo attribute seems to be passing different values than in the ones that work.

In the logs, when the paperclip function works, it looks like this

"image"=>#<File:/var/folders/M5/M5HEb+WhFxmqNDGH5s-pNE+++TI/-Tmp-/RackMultipart20100512-1302-5e2e6e-0>

when it does not, it seems to pass the file name directly

"foo"=>"foo_image.png"

I am developing locally on MacOSX using local rails and ruby libs.