Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
409 views
in Technique[技术] by (71.8m points)

python - How to specify Parent-Child relationship within one Model?

For example I have following code:

class FamilyMember(models.Model):
    user = models.OneToOneField(User)

And I have following situations:

a1 = FamilyMember.objects.get(id=1)
a1.first_name = 'John'
a1.last_name = 'Smith'
(a1 is a parent of a2)

a2 = FamilyMember.objects.get(id=2)
a2.first_name = 'Mark'
a2.last_name = 'Smith'
(a2 is a child of a1 and parent of a3 in the same time)

a3 = FamilyMember.objects.get(id=3)
a3.first_name = 'Jason'
a3.last_name = 'Smith'
(a3 is a child of a2)

How can i accomplish that kind of relationships within one model ?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You can do this with a simple ForeignKey to self to indicate the parent:

parent = models.ForeignKey('self', blank=True, null=True, related_name='children')

Now you can do a2.parent = a1, and will automatically get access to a1.children.all().


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...