SQLAlchemy如何在查询中联接多个模型

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.orm import joinedload
from sqlalchemy.orm import relationship
from sqlalchemy import Column, Integer, String, ForeignKey
from sqlalchemy.ext.declarative import declarative_base

engine = create_engine('数据库连接字符串')
Session = sessionmaker(bind=engine)
session = Session()

Base = declarative_base()

class ModelA(Base):
    __tablename__ = 'model_a'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    model_b_id = Column(Integer, ForeignKey('model_b.id'))
    model_b = relationship("ModelB")

class ModelB(Base):
    __tablename__ = 'model_b'
    id = Column(Integer, primary_key=True)
    name = Column(String)

query = session.query(ModelA).join(ModelA.model_b)
result = query.all()