'QuerySet' object has no attribute '_meta'

Late answer but worth it.

from django.shortcuts import get_object_or_404
...
def get_object(self, queryset=None):
    obj = get_object_or_404(Staff, pk=self.kwargs['staff_id'])
    return obj

This approach will return HTTP 404 Not Found response if object not found.

The get_object method returns queryset i.e list of records, instead of instance.To get instance you can use first() on filter() . This will gives you first occurrence.

def get_object(self, queryset=None):
    obj = Staff.objects.filter(pk=self.kwargs['staff_id']).first()
    return obj