0
我需要存储人与人之间的关系。所以，我有以下型号创建多个递归的m2m关系时出错
class Person(models.Model):
name = models.CharField(max_length=255, blank=True)
parents = models.ManyToManyField('self', through='PersonRelationship', symmetrical=False, blank=True, related_name="person_parents_set")
friends = models.ManyToManyField('self', through='PersonRelationship', symmetrical=False, blank=True, related_name="person_friends_set")
class PersonRelationship(models.Model):
from_person = models.ForeignKey(Person, related_name="from_persons")
to_person = models.ForeignKey(Person, related_name="to_persons")
relation_start = models.DateField(blank=True)
relation_end = models.DateField(blank=True)
当我尝试执行syncdb我得到这个错误：
Error: One or more models did not validate:
films.person: The model Person has two manually-defined m2m relations through the model PersonRelationship, which is not permitted. Please consider using an extra field on your intermediary model instead.
我想我不能有两个M2M关系槽相同的模型，所以我试图创建一个模型每种类型的关系，以避免重复自己，我用一个抽象模型是这样的：
class PersonRelationship(models.Model):
from_person = models.ForeignKey(Person, related_name="from_persons")
to_person = models.ForeignKey(Person, related_name="to_persons")
relation_start = models.DateField(blank=True)
relation_end = models.DateField(blank=True)
class Meta:
abstract = True
class PersonParent(PersonRelationship):
pass
class PersonFriend(PersonRelationship):
pass
而且我得到这个错误，但我已经有一个related_name：
films.personparent: Accessor for field 'from_person' clashes with related field 'Person.from_persons'. Add a related_name argument to the definition for 'from_person'.
films.personparent: Reverse query name for field 'from_person' clashes with related field 'Person.from_persons'. Add a related_name argument to the definition for 'from_person'.
films.personparent: Accessor for field 'from_person' clashes with related field 'Person.from_persons'. Add a related_name argument to the definition for 'from_person'.
films.personparent: Reverse query name for field 'from_person' clashes with related field 'Person.from_persons'. Add a related_name argument to the definition for 'from_person'.
任何帮助，将不胜感激。