DRF将URL参数传递到serizalizer中

Question

我们可以将URL queryset参数传递到serizalizer中进行分块/计算吗？

这是我的终点：?start_date=20210312&end_date=20210317

这是我的电视机：

class BrandChartsViewSet(ModelViewSet):
serializer_class = BrandChartsSerializer
pagination_class = BrandChartsPagination
queryset = Brand.objects.all()
def get_queryset(self):
start_date = self.request.query_params.get('start_date',None)
end_date = self.request.query_params.get('end_date',None)
if start_date is None:
raise InvalidInputError()
if end_date is None:
raise InvalidInputError()
start_date_obj = datetime.strptime(start_date,'%Y%m%d')
end_date_obj = datetime.strptime(end_date,'%Y%m%d')
serializer = BrandChartsSerializer(start_date_obj,end_date_obj)
queryset = Brand.objects.all()
return queryset

这是我的序列号：

class BrandChartsSerializer(serializers.ModelSerializer):
rankings = serializers.SerializerMethodField()
instagram = IGSerializer(allow_null=True)
facebook = FBSerializer(allow_null=True)
hashtags = BrandHashtagSerializer(allow_null=True, many=True)
# rename the json field
brand_uid = serializers.IntegerField(source='id')
brand_name = serializers.CharField(source='name')
origin = serializers.CharField(source="country")
class Meta:
model = Brand
fields = [
"brand_uid",
"brand_name",
"origin",
"rankings",
"instagram",
"facebook",
"hashtags",
]
def get_rankings(self, instance):
rank = instance.rankings.all().filter(created__gte=start_date_obj,
created__lte=end_date_obj
).order_by('created')
return BrandRankSerializer(rank, allow_null=True, many=True).data

并且它将在get_rankings中有Unresolved reference 'start_date_obj'，但是我试图通过class BrandChartsSerializer(serializers.ModelSerializer,start_date_obj,end_date_obj)将参数传递到serizalizer

它仍然会出错。

由于我的功能设计，我认为它不能使用DRF滤波器来处理它，我可以直接将参数传递给serizalizer来进行细化吗？(我需要过滤范围内的排名模型，并计算总和而不是回报(

Answer 1

在这种情况下，我们可以使用上下文。

试试这个。

更新get_rankings方法。

def get_rankings(self, instance):
start_date_obj = self.context.get("request").query_params.get("start_date")
end_date_obj = self.context.get("request").query_params.get("end_date")
rank = instance.rankings.all().filter(created__gte=start_date_obj,
created__lte=end_date_obj
).order_by('created')
return BrandRankSerializer(rank, allow_null=True, many=True).data