# models.py
class Data(models.Model):
    data_from_file = models.CharField(max_length=20)

# serializers.py
class DataSerializer(serializers.ModelSerializer):
    class Meta:
        model = Data
        fields = '__all__'

# views.py
class FileView(ListAPIView):
    serializer_class = DataSerializer

    def get_queryset(self):
        mult = self.request.query_params.get('mult', None)
        y = np.loadtxt('media/data_vv.txt')[:10]
        if mult is not None:
            y *= float(mult)
        y = list(y)
        x = list(range(len(y)))
        data = {'x': x, 'y': y}
        data = Data(data_from_file=data, id=1)
        data.save()
        queryset = Data.objects.all()
        return queryset