def get_or_create_dataset(self, name, top=None):
'''
returns existing or created dataset given a name
returns False if the dataset is not unique by name
top is the directory
'''
ds = Dataset.objects.filter(description=name,
experiments=self.experiment)
if len(ds) == 1:
return ds[0]
elif len(ds) > 1:
return False
ds = Dataset(description=name)
if top is not None:
ds.directory = top
ds.save()
self.tag_user(ds, top)
else:
ds.save()
ds.experiments.add(self.experiment)
return ds
