from sqlalchemy import Column, ForeignKey, Integer, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import lazyload, relationship, sessionmaker
Base = declarative_base()
class Group(Base):
__tablename__ = 'groups'
id = Column(Integer, primary_key=True)
users = relationship('User', lazy='raise')
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
group_id = Column(Integer, ForeignKey('groups.id'))
engine = create_engine('sqlite:///:memory:', echo=True)
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()
group = Group()
session.add(group)
session.commit()
group = session.query(Group).options(lazyload(Group.users)).first()
print('SUCCESS', group.users)
session.refresh(group)
print('FAILURE', group.users)
Is `session.expire(group)` is the only way to reload collections and
related items?
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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