以下是兩個角色:培訓師和培訓生。培訓師可能有多名學員。雖然每個學員可能只有一名教練或沒有教練。如何用django設計我的案例模型?
這裏是我的模型:
class TrainerShip(models.Model):
trainer = models.ForeignKey('Trainer')
trainee = models.ForeignKey(User)
request_date = models.DateTimeField(auto_now_add=True)
accept_date = models.DateTimeField(auto_now_add=True)
expiration_date = models.DateTimeField(auto_now_add=True)
class Trainer(models.Model):
user = models.ForeignKey(User, unique=True)
trainee = models.ManyToManyField(User, through=TrainerShip)
introduction = models.TextField(max_length=500)
certification = models.TextField(max_length=300)
specialties = models.TextField(max_length=300)
contact = models.TextField(max_length=100)
active = models.BooleanField(default=False)
我正在試圖創建數據庫時,以下錯誤:
[email protected]:~/django/sutifang$ ./manage.py syncdb Error: One or more models did not validate: registration.trainer: Accessor for field 'user' clashes with related m2m field 'User.trainer_set'. Add a related_name argument to the definition for 'user'. registration.trainer: Accessor for m2m field 'trainee' clashes with related field 'User.trainer_set'. Add a related_name argument to the definition for 'trainee'.
任何人有這個想法來解決這個問題?有沒有更好的方法來建模這種關係?
非常感謝。這是我第一次在這裏提出問題。 再次感謝! – user182863 2009-10-02 02:58:09