I already implemented it as discussed with Russell. See the ticket. But thanks for the tip with the __radd__. I didn't knew __radd__, but I will still implement it.
Btw, I still have to implement the Expression stuff into Query.add_filter to support filter() and exclude(), as proposed by Russel and I have to write test cases. I can't do this now, but I think I will do it in the next days. But it would be cool if somebody can already look on my latest patch, if it is ok. Thanks. Regards Sebastian Noack
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