尝试使用以下型号同步dbdb时：
class Contact(models.Model):
user_from = models.ForeignKey(User,related_name='from_user')
user_to = models.ForeignKey(User, related_name='to_user')
class Meta:
unique_together = (('user_from', 'user_to'),)
User.add_to_class('following', models.ManyToManyField('self', through=Contact, related_name='followers', symmetrical=False))
我收到以下错误：
Error: One or more models did not validate:
auth.user: Accessor for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'.
auth.user: Reverse query name for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'.
auth.user: The model User has two manually-defined m2m relations through the model Contact, which is not permitted. Please consider using an extra field on your intermediary model instead.
auth.user: Accessor for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'.
auth.user: Reverse query name for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'.