我有一个由不同类型的子级继承的顶级模型声明
class HasId(object):
@declared_attr
def id(cls):
return Column('id', Integer, Sequence('test_id_seq'), primary_key=True)
...
@declared_attr
def triggered_by_id(cls):
return Column(Integer, ForeignKey('tests.id'), nullable=True)
@declared_attr
def triggered(cls):
return relationship('TestParent',
foreign_keys='TestParent.triggered_by_id',
lazy='joined',
cascade='save-update, merge, delete, delete-orphan',
backref=backref('triggered_by', remote_side=[id])
)
class TestParent(HasId, Model):
__tablename__ = 'tests'
discriminator = Column(String(50))
__mapper_args__ = {'polymorphic_on': discriminator}
class FooTest(TestParent):
__tablename__ = 'footests'
__mapper_args__ = {'polymorphic_identity': 'footests'}
id = Column(Integer, ForeignKey('tests.id'), primary_key=True)
bar = Column(Boolean)
...
当IO试图构建这个数据库时,我得到了一个错误,这是由于我在triggered_by
关系上定义了backref
的remote_side
。在
完整的错误是
^{pr2}$
解决方案是将
backref
定义从到
^{pr2}$相关问题 更多 >
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