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试图从文档中这里展开：https://docs.djangoproject.com/en/1.10/topics/db/models/#extra-fields-on-many-to-many-relationshipsDjango的反向关系与递归M2M关系
的情况下更容易理解，Person对象，与自己M2M关系定义了两个人之间的“关系型”，像父/子/从事
我Models.py：
RELATIONSHIPS = (
(0, 'Child'),
(1, 'Parent'),
(2, 'Engaged'),
)
class Person(models.Model):
code = models.AutoField(primary_key=True, verbose_name="Person Code")
name = models.CharField(max_length=150, blank=True, null=True, verbose_name="Name")
relationships = models.ManyToManyField(
'self',
through = 'Person_Person', #This lets you define the model that will act as an intermadiary
symmetrical = False, #This needs to be set with recursive relationships
)
class Person_Person(models.Model):
person_1 = models.ForeignKey('Person', on_delete=models.CASCADE,
related_name='%(class)s_person_1', verbose_name="Person 1")
person_2 = models.ForeignKey('Person', on_delete=models.CASCADE,
related_name='%(class)s_person_2', verbose_name="Person 2")
relationship_type = models.IntegerField(choices = RELATIONSHIPS, default = 5, verbose_name="Relation")
测试代码：
p1 = Person.objects.create(name = 'Man')
p2 = Person.objects.create(name = 'Woman')
relation = Person_Person(person_1 = p1, person_2 = p2, relationship_type = 2)
reation.save()
print(p1.relationships.all(), p2.relationships.all())
#>><QuerySet [<Person: 108 Woman>]>
#>><QuerySet []>
现在对于这个问题，p2的关系字段queryset返回为空，我明白为什么当你考虑一个非递归关系时，但在这种情况下调用p2.relationships_set是没有意义的，即使它做到了，我会如何知道Person是person_1还是person_2的关系？
任何建议，欢迎