models.py

Question

我有两个简单关系的模型如下：

models.py

class Person(models.Model):
    first_name = models.CharField(max_length=20)
    last_name = models.CharField(max_length=20)

class PersonSession(models.Model):
    start_time = models.DateTimeField(auto_now_add=True)
    end_time = models.DateTimeField(null=True,
                                    blank=True)
    person = models.ForeignKey(Person, related_name='person_sessions')

views.py

class PersonFilter(django_filters.FilterSet):
    start_time = django_filters.DateFromToRangeFilter(
        name='person_sessions__start_time',
        distinct=True
    )

    class Meta:
        model = Person
        fields = ('first_name', 'last_name', 'start_time')

class PersonList(generics.ListCreateAPIView):
    queryset = Person.objects.all()
    serializer_class = PersonSerializer
    filter_backends = (django_filters.rest_framework.DjangoFilterBackend)
    filter_class = PersonFilter

如图所示，我想使用DateFromToRangeFilter，我希望我能得到这样的api：

api/persons?start_time_before=2018-04-20&start_time_after=2018-04-18

但这根本不起作用。看起来像post中所述，这种类型的过滤器的实现存在错误，但是帖子中的解决方案对我来说不起作用，因为我会得到两个内连接并得到与我预期的完全不同的结果。 / p>

Answer 1

class PersonFilter(django_filters.FilterSet):
      start_time_before = DateFilter(name='person_sessions__start_time',lookup_expr=('gt'),) 
      start_time_after = DateFilter(name='person_sessions__start_time',lookup_expr=('lt'))

如果你想要相同的网址，你可以使用这个类。

Answer 2

我也有类似的情况。也许对某人会有所帮助。

class Task(ComputedFieldsModel):
    created_at = models.DateTimeField(auto_now_add=True)
    tco_at = models.DateTimeField(null=True, blank=True)

class TaskRangeStatisticsView(GenericAPIView):
    queryset = Task.objects.all()
    serializer_class = TaskRangeStatisticsSerializer
    filterset_class = TaskRangeStatisticsBackend

    def get(self,request):
        queryset = self.filter_queryset(self.get_queryset()) \
            .annotate(date=TruncDay('created_at')) \
            .values("date") \
            .annotate(finished_count=Count('tco_at'),created_count=Count('created_at'),in_progress_count=Count('in_progress_at')) \
            .order_by("-date")
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)

class TaskRangeStatisticsBackend(df_filters.FilterSet):
    date = df_filters.DateFromToRangeFilter(field_name="created_at")
    # 'date_after': '2016-01-01', 'date_before': '2016-02-01'

    class Meta:
        model = Task
        fields = ["date"]

现在像http://127.0.0.1:8000/api/v1/test_tasks_statistics/?date_after=2021-06-01&date_before=2021-06-04 这样的查询工作正常

Django DateFromToRange过滤器似乎不起作用

models.py

views.py

2 个答案: