def validate(self, value):
if value is None:
value = {}
if isinstance(value, Table):
if self != value.meta:
# Make a table using ourself as the meta
value = value.to_dict()
value.pop("typeid", None)
value = Table(self, value)
else:
# Should be a dict
value = Table(self, value)
# Check column lengths
value.verify_column_lengths()
return value
