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試圖從文檔中這裏展開：https://docs.djangoproject.com/en/1.10/topics/db/models/#extra-fields-on-many-to-many-relationshipsDjango的反向關係與遞歸M2M關係
的情況下更容易理解，Person對象，與自己M2M關係定義了兩個人之間的「關係型」，像父/子/從事
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")
測試代碼：
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 []>
現在對於這個問題，p2的關係字段queryset返回爲空，我明白爲什麼當你考慮一個非遞歸關係時，但在這種情況下調用p2.relationships_set是沒有意義的，即使它做到了，我會如何知道Person是person_1還是person_2的關係？
任何建議，歡迎