python – factory-boy subfactory传递对象而不是key

我正在尝试创建Fact对象,我希望工厂男孩生成PatientDim对象,这些对象是Fact的外键.但是Subfactory没有传递密钥,而是将整个对象传递给foreignkey字段.

我怎样才能通过Subfactory传递PatientDim键？

Factories.py

class FactFactory(SQLAlchemyModelFactory):
    class Meta:
        model = models.Fact
        sqlalchemy_session = common.Session

    patient_id = factory.SubFactory(PatientDimFactory)

class PatientDimFactory(SQLAlchemyModelFactory):
    class Meta:
        model = models.PatientDim
        sqlalchemy_session = common.Session

Models.py

class Fact(TimeStampedModel):
    class Meta:
        db_table = 'fact'

    id = Column(Integer,primary_key=True)
    patient_id = Column('patient_id',Integer,ForeignKey(PatientDim.__table__.c.id),nullable=False)
    patient = relationship(PatientDim,foreign_keys='Fact.patient_id' )

Base = declarative_base()
class PatientDim(TimestampMixin,Base):
    __tablename__ = 'patient_dim'

    id = Column('id',primary_key=True)