MotorEngine-如何在模型中表示外键的等效项？

Question

In MongoDB I have a document that represents a Balance which has an Stakeholder's ID as a field.

I need to relate these two classes, Balance and Stakeholder, but I don't know what's the proper way. I've seen there's a field that could be appropiate but I still don't understand it: EmbeddedDocumentField()

class Balance(Document):
    id = UUIDField()
    creation_date = DateTimeField(auto_now_on_insert=True)
    gross_balance = FloatField(required=True, min_value=0, default=0)
    balances_description = StringField(required=True, max_length=255)
    stake_holder = #FK to Stakeholder

class Stakeholder(Document):
    ...

Any idea?

Answer 1

如果涉stake_holder表示其他集合中的文档，而stake_holder是ObjectId，则应使用ReferenceField（）

stake_holder = ReferenceField(reference_document_type=Stakeholder)