你如何查询可以嵌套的评论帖?
from django.db import models
class Comment (models.Model):
# if parent is blank, comment is top level
parent = models.ForeignKey('Comment',
related_name='children',
null=True)
text = models.TextField(blank=True)
def __repr__(self):
return self.text
"""
from tree.models import Comment
c1 = Comment(text='c1')
c1.save()
c11 = Comment(text='c11', parent=c1)
c12 = Comment(text='c12', parent=c1)
c11.save()
c12.save()
c111 = Comment(text='c111', parent=c11)
c112 = Comment(text='c112', parent=c11)
c111.save()
c112.save()
c1.children.all() -> return [c111, c112] should return [c111, c112, c11, c12]
"""
在上面的例子中,我创建了一个树
c1
c11 c12
c111 c112
并尝试查询c1的子项,但它只返回直接子项。我是否必须在序列化程序中编写自定义查询?