如何在DRF

Question

我有一个嵌套的序列化程序，我想将父序列化数据传递给子。但我不明白我该怎么做。我想做这样的事情：

class BookingSerializer(serializers.ModelSerializer):
    use_additional_fields = serializers.BooleanField()
    persons = PersonSerializer(many=True)



class PersonSerializer(serializers.ModelSerializer):

    def validate_date_of_birth(self, value):
       if parent.use_additional_fields and not value:
          raise serializers.ValidationError(_('Date of birth is required'))
       return value

    class Meta:
        model = Person
        exclude = ('phone', 'date_of_birth')

因此，如果用户在父序列化程序中选择use_additional_fields，则应该需要子序列化程序中的某些字段

Answer 1

您可以直接从请求对象获取数据：

class PersonSerializer(serializers.ModelSerializer):

    def validate_date_of_birth(self, value):
       if self.context['request'].data.get('use_additional_fields') and not value:
          raise serializers.ValidationError(_('Date of birth is required'))
       return value

    class Meta:
        model = Person
        exclude = ('phone', 'date_of_birth')

请注意，如果您在视图中手动启动序列化程序实例，则应将请求传递给序列化程序context：

serializer = BookingSerializer(data=data, context={'request': request})