No validated date returned by serializer

问题

I get all the devices from a user and pass them to my serializer. He should return a supplier in validated data, but doesn't. Probably because I give more objects than one. How do I get validated data if I give more than one object?

view:

    serializer_class = AdminSiteDevicePatchSerializer
    serializer = serializer_class(
        devices, many=True, data=request.data, partial=True,
    )
    serializer.is_valid(raise_exception=True)

serializer:

class AdminDeviceInfoSerializer(AdminDeviceSerializer):
    class Meta(AdminDeviceSerializer.Meta):
        fields = AdminDeviceSerializer.Meta.fields + [
            "supplier",
        ]

    def to_representation(self, device):
        data = super().to_representation(device)
        if not device.supplier:
            data["supplier"] = None
        data["supplier"] = SupplierSerializer(device.supplier).data
        return data

来源：https://stackoverflow.com/questions/60831100/no-validated-date-returned-by-serializer