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我需要存儲人與人之間的關係。所以，我有以下型號創建多個遞歸的m2m關係時出錯
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)
當我嘗試執行syncdb我得到這個錯誤：
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.
我想我不能有兩個M2M關係槽相同的模型，所以我試圖創建一個模型每種類型的關係，以避免重複自己，我用一個抽象模型是這樣的：
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
而且我得到這個錯誤，但我已經有一個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'.
任何幫助，將不勝感激。