I solved it , thanks your reply.
On Mon, Oct 8, 2018 at 1:36 AM Jason wrote:
> Are you sure you have a record in the db with machine_code = 60?
>
> your model defines that field as a CharField, so using an integer in the
> URL makes me suspect you're using a primary key, which is very different
> from the definition of get_queryset
>
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