如何从sqlalchemy中的连接表中进行过滤？

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

# 创建数据库引擎和会话
engine = create_engine('数据库连接字符串')
Session = sessionmaker(bind=engine)
session = Session()

# 创建基类
Base = declarative_base()

# 定义模型类
class Department(Base):
    __tablename__ = 'departments'
    id = Column(Integer, primary_key=True)
    name = Column(String)

class Employee(Base):
    __tablename__ = 'employees'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    department_id = Column(Integer, ForeignKey('departments.id'))
    department = relationship(Department)

# 进行连接表查询和过滤
query = session.query(Employee).join(Employee.department).filter(Department.name == 'IT部门')
results = query.all()

# 打印结果
for employee in results:
    print(employee.name)

# 关闭会话
session.close()