def validate(self, data):
"""Only allow known keys, and convert -1 or empty strings to None"""
validate_keys(self)
data = {key: nonify(value) for key, value in data.items()}
return data
def validate_hinfo(self, value):
value = nonify(value)
if value is not None:
value = HinfoPreset.objects.get(pk=value)
return value