def add_to_slice(self, slice, next):
        info, created = PlanetLabSliceInfo.objects.get_or_create(slice=slice)
        slice.aggregate.add(self)
        return next
Create a PlanetLabSliceInfo instance for this slice if none exists.
dataset/ETHPy150Open fp7-ofelia/ocf/expedient/src/python/expedient_geni/planetlab/sfa-models.py/PlanetLabAggregate.add_to_slice