Můžete použít hybridní_vlastnost .V tom případě by zjednodušená verze vašeho kódu měla vypadat takto:
from sqlalchemy.ext.hybrid import hybrid_property
class Transcriber(Base):
__tablename__ = 'transcribers'
__table_args__ = (
UniqueConstraint('projectid', 'email'),
)
transcriberid = Column(Integer, primary_key=True, server_default=text("nextval('transcribers_transcriberid_seq'::regclass)"))
projectid = Column(ForeignKey(u'projects.projectid', ondelete=u'CASCADE'), index=True)
created = Column(DateTime, nullable=False, server_default=text("now()"))
onwebsite = Column(Boolean, nullable=False, server_default=text("true"))
_email = Column('email', Text, nullable=False)
@hybrid_property
def email(self):
return self._email
@email.setter
def email(self, email):
self._email = email