Ruby Forum Ruby on Rails > safari and firefox return different objects from a form

Hi, been having problems with my image uploads with Safari and firefox,
i get it working with one, and it brakes in the other, and vice versa.
This problem manifests itself during an edit, if no image is selected on
the form.

I have the following code in my model:

  def main_picture=(picture_field)
    STDERR.puts picture_field
    if picture_field != ""
      File.open("public/images/#{sanitize_filename(picture_field.original_filename)}",
"w") { |f| f.write(picture_field.read) }
    end
  end

if i excersise exactly the same code in both browsers, i get different
output for the line  STDERR.puts picture_field

firefox gives me:

#<StringIO:0x256860c>

safari gives me a blank line. It also gives me the error:

undefined method `original_filename' for "":String

It seems that firefox correctly returns a picture object, but safari
returns a blank string.

Any ideas?