Django ORM 过滤

Question

我的模型如下所示：

Person(model.Models):
    name = model.CharField(max_length=32)
    date_added = models.DateTimeField(auto_now_add=True)

Note(model.Models):
    person = model.ForeignKey(Person)
    action = model.CharField(max_length=32, default='call)
    date_added = models.DateTimeField(auto_now_add=True)
    owner = model.ForeignKey(User)

我的看法：

def get_working_persons(self):
    relevant_actions = ['call', 'meeting', ...]
    query = Q(action__in=relevant_note_actions) | Q(date_added__range=[fourteen_days_ago, now])
    get_current_person_notes = Note.objects.filter(query).exclude(~Q(owner=request.user)).values('owner', 'action', 'person')

这将返回一个笔记列表，其中每个人都有列出的所有笔记，这些笔记发布在 date_added__range 内。如何获取该日期范围内每个人的最后一个符合其他条件的注释？

Answer 1

Note.objects.filter(query).exclude(~Q(owner=request.user)).values('owner', 'action', 'person').first()

将返回查询集的顶部对象 或

Note.objects.filter(query).exclude(~Q(owner=request.user)).values('owner', 'action', 'person').last()

将返回查询集的最后一个对象

或按字段名最新的

 Note.objects.filter(query).exclude(~Q(owner=request.user)).values('owner', 'action', 'person').latest('field_name')