如何为模型中的日期字段创建月/年的django筛选器自定义筛选器?

我正在尝试根据日期的月份和年份筛选日期。下面是我试过的。在模型中

class Expense(TimeStampedModel):date = models.DateField(_('date')

在serailizer.py中

class ExpenseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Expense
        fields = '__all__'

在filters.py中

class ExpenseFilter(django_filters.FilterSet):
    date__month = django_filters.DateFilter(field_name='date',                  
    lookup_expr='month')
    date__year = django_filters.DateFilter(field_name='date', lookup_expr='year')
    class Meta:
        model = Expense
        fields = ('date__month', 'date__year')

在VIEW中

class ExpenseViewSet(viewsets.ModelViewSet):
    queryset = Expense.objects.all()
    serializer_class = ExpenseSerializer
    filter_class = ExpenseFilter

当我试着打 http://127.0.0.1:8000/expense/?date__year=2019 我得到一个空结果。对此,我们将非常感谢您的帮助。