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這一塊我的代碼自定義可鏈接查詢集
from django.db import models
from django.db.models.query import QuerySet
from mptt.models import MPTTModel
from base.models import Content, OrderedContent
class ArgumentQuerySet(QuerySet):
def statements_with_count(self, *args, **kwargs):
from statement.models import Statement
statements = Statement.objects.none()
result = self
for node in result:
statements_node = Statement.objects.filter(arguments__in = node.get_descendants(include_self = True), *args, **kwargs).distinct()
statements |= statements_node
setattr(node, 'count', statements_node.count())
statements = statements.distinct()
setattr(result, 'statements', statements)
setattr(result, 'count', statements.count())
return result
class ArgumentManager(models.Manager):
def get_query_set(self):
return ArgumentQuerySet(self.model)
class Argument(MPTTModel, OrderedContent):
parent = models.ForeignKey('self', null=True, blank=True)
objects = ArgumentManager()
class MPTTMeta:
parent_attr = 'parent'
order_insertion_by = ['weight', 'title', ]
def __unicode__(self):
return self.title
下面的命令給我的出席結果
a = Argument.objects.filter(title__icontains = 'function')
b = a.statements_with_count()
否則,下面的命令不起作用
c = Argument.objects.get(id = 514)
d = c.get_children()
e = d.statements_with_count()
我該如何解決這個問題?