在SqlAlchemy模型类定义中通过@property获取Python getter和setter:HOWTO

Question

所以我对sqlalchemy和ORM很新.我有一个现有的数据库,postgresql,我已经创建了一个模型来与数据库进行通信.下面是我的Transcribers表的类.通过它查询时,所有这些都有效.我只是在课堂上设置getter和setter时遇到问题.

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)
    email = Column(Text, nullable=False)
    created = Column(DateTime, nullable=False, server_default=text("now()"))
    onwebsite = Column(Boolean, nullable=False, server_default=text("true"))

    def __repr__(self):
        return "<Transcriber(transcriberid:'%s', projectID:'%s', email:'%s', created:'%s', onwebsite:'%s'" \
        %(self.transcriberid, self.projectid, self.email, self.created,   self.onwebsite)

    @property
    def transcriberid(self):
        return self.transcriberid

    def email(self):
        return self.email

    @email.setter
    def email(self, value):
        self.email = value

    project = relationship(u'Project')

我不知道如何使用@property方法访问对象中的不同变量.我想使用这种方法,因为我相信它更加pythonic.

那么现在我如何实际调用这些方法.他们是否正确设置.

我在启动Class时收到此错误

Traceback (most recent call last):
File "./test.py", line 4, in <module>
   from peraAPI import DBSession, getProjectbyId, getTransById
     File "/Users/tcrha/bin/working/PeraPera/peraAPI/__init__.py", line 7, in <module>
from model_local import Project, Transcriber
  File "/Users/tcrha/bin/working/PeraPera/peraAPI/model_local.py", line 110, in <module>
class Transcriber(Base):
  File "/Users/tcrha/bin/working/PeraPera/peraAPI/model_local.py", line 133, in      Transcriber
@email.setter
AttributeError: 'function' object has no attribute 'setter'

Answer 1

您可以使用hybrid_property.在这种情况下,代码的简化版本应如下所示:

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