如何在Django ORM中对datetime字段进行group by查询？在

型号：class test1(models.Model):

id = models.AutoField(primary_key=True, unique=True, verbose_name='id')

name = models.CharField(verbose_name='name', max_length=200)

cdate = models.DateField(verbose_name='date', default=timezone.now)

查询集数据

^{pr2}$

需要按月分组并用Django orm计算id。在

奎里塞特data = test1.objects.annotate(month=TruncMonth('cdate')).values('month').annotate(c=Count('id'))

for i in data:

print i

结果{'c': 1, 'month': datetime.date(2017, 8, 1)}

{'c': 1, 'month': datetime.date(2017, 8, 1)}

{'c': 1, 'month': datetime.date(2017, 8, 1)}

{'c': 1, 'month': datetime.date(2017, 8, 1)}

{'c': 1, 'month': datetime.date(2017, 8, 1)}

为什么不呢？在{'c': 5, 'month': datetime.date(2017, 8, 1)}