我正在为新项目创建一个数据模型,其中必须使用flask-mongoengine使用Many2Many,Many2One,One2Many参考。有人可以描述如何使用mongoengine定义Many2Many和其他参考字段吗?
答案 0 :(得分:0)
以下是最常用的方法:
1)一对多,带有一个简单的ReferenceField
class Client(Document):
name = StringField()
@property
def account(self):
return Account.objects(client=self).get()
class Account(Document):
client = ReferenceField(Client)
bob = Client(name='Bob').save()
acc1 = Account(client=bob).save()
acc2 = Account(client=bob).save()
2)Many-2-Many with a list(ReferenceField)
class Client(Document):
name = StringField()
@property
def accounts(self):
return Account.objects(client=self)
class M2MAccount(Document):
clients = ListField(ReferenceField(Client))
bob = Client(name='Bob').save()
john = Client(name='John').save()
m2m_acc = M2MAccount(clients=[bob, john]).save()
请注意,@property是可选的,仅为方便起见