如何在 django Rest 框架中将查询参数传递给 SerializerMethodField？

Question

我想根据 GET 调用中获得的查询参数过滤掉一些实例。

class RevisionSerializer(serializers.ModelSerializer):
    slot_info = serializers.SerializerMethodField(required=False, read_only=True)
    batch_config = serializers.SerializerMethodField(required=False, read_only=True)

    class Meta:
        model = Revision
        fields = ['id', 'status', 'revision_id', 'instructor', 'number_of_classes', 'start_date',
                  'slot', 'slot_info', 'tinyurl', 'zoom_link', 'batch_config']
        read_only_fields = ['revision_id']

    def get_batch_config(self, obj):
        # filter this on the incoming data from the GET call
        related_batches = CompensationClass.objects.select_related('style', 'instructor').filter(
            compensation_class_id=obj.revision_id)

        batch_config_values = related_batches.values('batch_id', 'age_group', 'level', 'course_version', 'style__name',
                                                     'class_number')
        return batch_config_values

这是我的序列化器，我将传递一个日期，并根据该日期我想过滤我的序列化器方法字段。我怎样才能实现这个目标？

Answer 1

您可以使用其上下文将参数传递给序列化器：

# views.py
class RevisionView(GenericAPIView):
    serializer_class = RevisionSerializer

    def get_serializer_context(self):
        return {'revision_id': self.request.GET.get('revision_id')}

# serializers.py
class RevisionSerializer(serializers.ModelSerializer):
    
    def get_batch_config(self, obj):
        related_batches = CompensationClass.objects.select_related('style', 'instructor').filter(
            compensation_class_id=self.context.get('revision_id'))