Use the hybrid extension:
from sqlalchemy.ext.hybrid import hybrid_property
class Person(Base):
# ...
@hybrid_property
def name(self):
return '{0} {1}'.format(self.first_name, self.last_name)
@name.setter
def name(self, value):
self.first_name, self.last_name = value.split(' ', 1)
@name.expression
def name(cls):
return db.func.concat(cls.first_name, ' ', cls.last_name)