Quick question: Why am I allowed to persist an address with no
person_id? Shouldn't the delete-orphan prohibit this?
Thanks,
Michael
from sqlalchemy import Column, Integer, String, ForeignKey, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker, relationship,
backref
Base = declarative_base()
Session = scoped_session(sessionmaker())
def init_model(dsn):
engine = create_engine(dsn)
Session.configure(bind=engine)
Base.metadata.bind = engine
Base.metadata.create_all(engine)
class Person(Base):
__tablename__ = 'person'
id = Column(Integer, primary_key=True)
name = Column(String(50))
addresses = relationship("Address", backref="person", cascade="all,
delete-orphan")
class Address(Base):
__tablename__ = 'address'
id = Column(Integer, primary_key=True)
email = Column(String(50))
person_id = Column(Integer, ForeignKey('person.id'))
#backref: person
init_model('sqlite:///:memory:')
s = Session()
s.add(Person(name='Isaac'))
s.commit()
s.add(Address(email='[email protected]'))
s.commit()
for adr in s.query(Address).all():
print adr.email
print adr.person_id
'''
Why am I allowed to persist an address with no person_id?
Shouldn't the delete-orphan prohibit this?
'''
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