Django Rest Framework Recursive Nested Parent Serialization

问题

I have a model with a self referential field called parent. Model:

class Zone(BaseModel):
    name = models.CharField(max_length=200)
    parent = models.ForeignKey('self', models.CASCADE, blank=True, null=True, related_name='children')

    def __unicode__(self):
        return self.name

Serializer:

class ZoneSerializer(ModelSerializer):
    parent = PrimaryKeyRelatedField(many=False, queryset=Zone.objects.all())
    parent_disp = StringRelatedField(many=False, source="parent")

    class Meta:
        model = Zone
        fields = ('id', 'name', 'parent', 'parent_disp')

Now I want to serialize the parent of the zone and its parent and its parent till parent is none. I found recursive serialization methods for children but not for parent. How can I do this?

回答1:

Try use SerializerMethodField here:

def get_parent(self, obj):
    # query what your want here.

I'm not sure D-R-F has build-in methods for this, but you can use query to get what you want in this method.

回答2:

Ok, I got it working like that.

class ZoneSerializer(ModelSerializer):
    parent = SerializerMethodField()

    class Meta:
        model = Zone
        fields = ('id', 'name', 'project', 'parent',)

    def get_parent(self, obj):
        if obj.parent is not None:
            return ZoneSerializer(obj.parent).data
        else:
            return None

来源：https://stackoverflow.com/questions/39104575/django-rest-framework-recursive-nested-parent-serialization