File upload problems when moving application to new server

I'm having some problems with file upload on my rails application.

Everything works as expecteded, except file upload. I can upload some files (such as Word-documents), but others (such as InDesign- documents) results in an error (type 500). I suspect this has something to do with mime types (?), but don't know where to start fixing the problem. When getting an error, the application spits out the contents of the file I'm trying to upload to the log file:

Processing DocumentController#upload (for xx.xx.xx.xx at 2007-12-21 14:45:48) [POST]   Session ID: (...)   Parameters: {"commit"=>"Upload", "action"=>"upload", "id"=>"111", "controller"=>"document", "myfile"=>{"myfile"=>"...a lot to data here ..."}} NoMethodError (undefined method `read' for #<String:0x237fb20>):

I am currently moving the application to a new server, and the everything worked OK on the old one. It is the new server that has problems. Both machines uses the same rails application and configuration files, and are having the following configuration:

Working server: PowerMac (Quad Intel), running Mac OS X Tiger Rails 1.2.3 Nginx web server mongrel cluster with 3 processes

New server (with problem) PoweMac G5, running Mac OS X Leopard Rails 1.2.6 (could not install 1.2.3) Nginx web server mongrel cluster with 3 processes

The relevant code: # === CONTROLLER === def upload   # Get request => show the form   if request.get?      @myfile = Myfile.new   else     # Do the upload     @myfile = Myfile.new(params[:myfile])

    # ... (Setting Myfile data here)

    # Check if filename exists     if not Myfile.find_by_filename_and_folder_id(@myfile.filename, folder_id).blank?       @myfile.filename = @myfile.filename + ' (' + Time.now.strftime('%Y%m%d%H%M%S') + ')'     end

    if @myfile.save       redirect_to(:controller => 'project', :action => 'show', :id => project_id, :folder_id => params[:folder_id])     end   end end

# ==== VIEW ==== <h1>File upload</h1>

<% form_tag({:action => 'upload', :folder_id => controller.folder_id}, {:multipart => true}) do -%>   <%= error_messages_for('myfile') %>   <label for="myfile_name">Choose file:</label>   <br/>   <%= file_field('myfile', 'myfile') %><br />   <br />   <%= submit_tag 'Upload' %> <% end -%>

# ==== MODEL ==== # Save file to folder   def myfile=(myfile_field)     if myfile_field and myfile_field.length > 0       @date_time_created = Time.now.to_f       if File.open("#{RAILS_ROOT}/uploads/#{@date_time_created}", 'wb') { |f| f.write(myfile_field.read) } # only save in the database if this succeeds         self.filename = Myfile.base_part_of(myfile_field.original_filename)         filesize = (myfile_field.length / 1000).to_i         if filesize == 0           self.filesize = 1         else           self.filesize = filesize         end       end     end   end

I'm grateful for any help!

This issue was fixed when upgrading from Rails 1.2.6 to 2.0.2.