Controller.rb

# POST /game_entries.json
  def create
    @game_entry = GameEntry.new(JSON.parse(params["entry"]))

    respond_to do |format|
      if @game_entry.save
        format.json { render :json => { :status => true, :content => @game_entry } }
      else
end
end

Log

Started POST "/game_entries" for 127.0.0.1 at 2011-12-02 16:57:50 +0100
  Processing by GameEntriesController#create as */*
  Parameters: {"entry"=>"{\"data\":\"data\",\"user_id\":\"5\",\"game_id\":0}", "Filename"=>"yodel.mp3", "data"=>[#<ActionDispatch::Http::UploadedFile:0x007fd8dc1e8770 @original_filename="yodel.mp3", @content_type="text/binary", @headers="Content-Disposition: form-data; name=\"data[]\"; filename=\"yodel.mp3\"\r\nContent-Type: text/binary\r\n", @tempfile=#<File:/var/folders/mc/0ky0qn9x7352978dj8xvm1nw0000gn/T/RackMultipart20111202-44004-vb244s>>], "Upload"=>"Submit Query"}
WARNING: Can't verify CSRF token authenticity
   (0.1ms)  SELECT 1 FROM "game_entries" WHERE ("game_entries"."user_id" = 5 AND "game_entries"."game_id" = 0) LIMIT 1
  SQL (59.3ms)  INSERT INTO "game_entries" ("created_at", "data_content_type", "data_file_name", "data_file_size", "data_updated_at", "game_id", "score", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)  [["created_at", Fri, 02 Dec 2011 15:57:50 UTC +00:00], ["data_content_type", nil], ["data_file_name", nil], ["data_file_size", nil], ["data_updated_at", nil], ["game_id", 0], ["score", nil], ["updated_at", Fri, 02 Dec 2011 15:57:50 UTC +00:00], ["user_id", 5]]
[paperclip] Saving attachments.