Solved Rails 3.0.3 temp_file size problem. Maybe this needs a more solid fix

[procommerz]

Here's the new Technoweenie::AttachmentFu::InstanceMethods.temp_path method code that nails down this problem:

def temp_path
    p = temp_paths.first

    if p.is_a?(ActionDispatch::Http::UploadedFile) # Rails 3.0.3 compatability fix
      p.tempfile.path
    else
      p.respond_to?(:path) ? p.path : p.to_s
    end
end

It appears, that attachment_fu expected temp_paths.first to be a File, but with Rails 3.0.3 it turns out to be an ctionDispatch::Http::UploadedFile, which is wrapped around a file and won't provide 'path' accessor directly.

[technoweenie]

I don't use the plugin anymore. If you submit a pull request with a working fix, I'll gladly apply it though.