0
作为this question的后续操作,我想查明发生的实际错误。我做错了什么,或者这是一个错误?Django动态过滤器故障
f = {'groups__isnull': 'True'}
students1 = models.Student.objects.filter(**f)
students2 = models.Student.objects.filter(groups__isnull=True)
这两个查询应该是相同的,但不是。
仅供参考,我的模型:
class Student (models.Model):
user = models.ForeignKey(User, unique=True, null=False, related_name='student')
teacher = models.ForeignKey(User, null=False, related_name='students')
assignment = models.ForeignKey(LabJournal, blank=True, null=True, related_name='students')
class JournalGroup (models.Model):
title = models.CharField(null=False, max_length=256)
owner = models.ForeignKey(User, null=True, related_name='journal_groups')
members = models.ManyToManyField(Student, blank=True, related_name='groups')