Question

我想了解每天在Django中创建的记录数，但我无法使其正常工作。到目前为止，我已经得到了这个：

data = Reservation.objects\
        .order_by('created_at')\
        .extra({'dp': "date(created_at)"}) \
        .values('dp').annotate(count=Count('id'))

返回

<QuerySet [{'count': 1, 'dp': datetime.date(2017, 2, 28)}, {'count': 1, 'dp': datetime.date(2017, 2, 28)}, {'count': 1, 'dp': datetime.date(2017, 2, 28)}, {'count': 1, 'dp': datetime.date(2017, 2, 28)}, {'count': 1, 'dp': datetime.date(2017, 3, 1)}, {'count': 1, 'dp': datetime.date(2017, 3, 1)}, {'count': 1, 'dp': datetime.date(2017, 3, 1)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, {'count': 1, 'dp': datetime.date(2017, 3, 2)}, '...(remaining elements truncated)...']>

我如何统计dp条记录，以便获得：

<QuerySet [{'count': 4, 'dp': datetime.date(2017, 2, 28)}{'count': 3, 'dp': datetime.date(2017, 3, 1)},..

Answer 1

这应该是最后一个：

.order_by('dp')

Answer 2

您对模型预订有任何元排序吗？否则查询应该可以正常工作

Django在created_at上注释

2 个答案: