attachment_fu content_type problem

Hi all....

Admittedly I'm new to Rails and trying to find my way but I'm having an issue with uploading documents with attachment_fu.

I have a form where I'm uploading multiple attachments (using AJAX to add file_filed_tags). That seems to work pretty well. The problem is I can't seem to get the content_type to work as I would expect. For example, if I use this:

has_attachment :content_type => ['application/pdf', 'application/ msword', 'text/plain']

I would expect I can upload .pdf, .doc and .txt files but I get and Document is invalid error (document is the name of my model) I have played around with different content_types but I can't seem to get consistent results.

Thanks for any help.

- Mark

Here is the document model

class Document < ActiveRecord::Base   belongs_to :tournament, :polymorphic => true

  has_attachment :content_type => ['application/pdf', 'application/ msword', 'text/plain'],                  :storage => :file_system,                  :max_size => 1.megabyte

  validates_as_attachment

end