在PonyORM中访问一对多关系中的值

from pony.orm import *

db = Database()

class Parent(db.Entity):
    id = PrimaryKey(int, auto=True)
    name = Required(str)
    children = Set('Child')

class Child(db.Entity):
    id = PrimaryKey(int, auto=True)
    name = Required(str)
    parent = Required(Parent)

db.bind(provider='sqlite', filename='database.sqlite', create_db=True)
db.generate_mapping(create_tables=True)

with db_session:
    parent = Parent.get(id=1)
    children = parent.children
    for child in children:
        print(child.name)