python – ManyToManyField与抽象模型

class Participant(Person):
    passport_number = models.IntegerField(verbose_name=_('Passport Number'),db_column=u'PassportNumber')

    class Meta:
        db_table = u'Participant'

class Journey(BaseModel):
    participants = models.ManyToManyField(Participant,related_name='%(app_label)s_%(class)s_participants',through=u'ParticipantJourney')

    class Meta:
        abstract = True

class PlaneJourney(Journey):
    flight_number = models.CharField(max_length=16,verbose_name=_('Flight Number'),db_column=u'FlightNumber')

    class Meta:
        db_table = u'PlaneJourney'

class ParticipantJourney(BaseModel):
    participant = models.ForeignKey(Participant,verbose_name=_('Participant'),db_column=u'ParticipantId')

    journey_content_type = models.ForeignKey(ContentType,related_name='journey_content_type')
    journey_object_id = models.PositiveIntegerField()
    journey = generic.GenericForeignKey('journey_content_type','journey_object_id') # models.ForeignKey(Journey,verbose_name=_('Journey'),db_column=u'JourneyId')

    payment_content_type = models.ForeignKey(ContentType,related_name='payment_content_type')
    payment_object_id = models.PositiveIntegerField()
    payment = generic.GenericForeignKey('payment_content_type','payment_object_id') # models.ForeignKey(Payment,verbose_name=_('Payment'),db_column=u'PaymentId')

    class Meta:
        db_table = u'ParticipantJourney'

ParticipantJourney模型将参与者与旅程联系起来,现在旅程是抽象的,因为它可以通过任何数量的不同运输方式制作,每种运输方式都有各自的领域.我认为这个设置是正确的但我收到以下错误消息：

Error: One or more models did not validate:
kandersteg.planejourney: ‘participants’ is a manually-defined m2m relation through model ParticipantJourney,which does not have foreign keys to Participant and PlaneJourney

我需要保留链接表的手动定义,这样我也可以将付款链接到所述旅程,所以我真的不知道下一步该去哪里,如果有人可以解决一些问题,那我真的很棒！

干杯,
亚历克斯