Hello,
using Python 2.6 and SA 0.6.6. Please see the example below. I want to
get the History of a relationship attribute, but whatever I pass to the
"passive" argument, I never get the "deleted version" of the object,
only the PASSIVE_NO_RESULT symbol (if I understand correctly, I would
not need to pass anything). Where is the error in my reasoning with this?
Cheers
Sebastian
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine, Column, Integer, String, ForeignKey
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.orm.attributes import get_history
Base = declarative_base()
engine = create_engine('sqlite:///:memory:')
Base.metadata.bind = engine
Session = sessionmaker(bind = engine)
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key = True)
name = Column(String)
def __init__(self, name):
self.name = name
def __repr__(self):
return "<User('%s')>" % (self.name)
class Address(Base):
__tablename__ = "addresses"
id = Column(Integer, primary_key = True)
user_id = Column(Integer, ForeignKey('users.id'))
user = relationship('User', backref = 'addresses')
street = Column(String)
def __init__(self, street):
self.street = street
def __repr__(self):
return "<Address('%s')>" % (self.street)
Base.metadata.create_all(engine)
session = Session()
u = User("joe")
a = Address("Downing Street")
u.addresses.append(a)
session.add(u)
session.commit()
u2 = User("jack")
a.user = u2
print get_history(a, "user")
#([<User('jack')>], (), [<symbol 'PASSIVE_NO_RESULT>])
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