views.py 文件源码

def get_object(self):
        """
        Primary key lookup if pk numeric, otherwise use custom filter kwargs.

        This allows us to also support build 37 lookup by chromosome, position,
        reference and variant.
        """
        if self.kwargs['pk'].isdigit():
            return super(VariantViewSet, self).get_object()

        queryset = self.filter_queryset(self.get_queryset())

        filter_kwargs = self._custom_variant_filter_kwargs(self.kwargs['pk'])
        if not filter_kwargs:
            raise Http404('No {} matches the given query.'.format(
                queryset.model._meta.object_name))

        obj = get_object_or_404(queryset, **filter_kwargs)
        self.check_object_permissions(self.request, obj)
        return obj