django-rest-framework에서 일반 관계 직렬화

Question

Django-Rest-Framework에서 GenericRelations를 사용하는 방법을 배우려고합니다. serializer relations에 대한 문서화 페이지를 발견하고 코드를 따랐습니다. TaggedItemSerializer 안에 지금

class BookmarkSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Bookmark 
     fields = ('url', 'link_url',) 


class NoteSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Note 
     fields = ('url', 'text',) 


class TaggedObjectRelatedField(serializers.RelatedField): 
    """ 
    A custom field to use for the 'tagged_object' generic relationship 
    """ 

    def to_representation(self, value): 
     """ 
     Serialize tagged objects to their respective serializer formats 
     :param value: 
     :return: 
      serializer.data 
     """ 
     if isinstance(value, Bookmark): 
      return 'Bookmark: ' + value.url 
     elif isinstance(value, Note): 
      return 'Note: ' + value.text 
     raise Exception('Unexpected type of tagged object') 


class TaggedItemSerializer(serializers.ModelSerializer): 
    tagged_object = TaggedObjectRelatedField() 
    class Meta: 
     model = TaggedItem 
     fields = ('url', 'id', 'tag_name', 'tagged_object') 

무엇을 TaggedObjectRelatedField (에 입력해야한다) :

class TaggedItem(models.Model): 
    """ 
    Tags arbitary model instance using a generic relation. 

    """ 
    tag_name = models.SlugField() 
    content_type = models.ForeignKey(ContentType) 
    object_id = models.PositiveIntegerField() 
    tagged_object = GenericForeignKey('content_type', 'object_id') 

    def __unicode__(self): 
     return self.tag_name 

class Bookmark(models.Model): 
    """ 
    A bookmark consists of a URL, and 0 or more descriptive tags. 
    """ 
    link_url = models.URLField() 
    tags = GenericRelation(TaggedItem) 

class Note(models.Model): 
    """ 
    A note consists of some texts, and 0 or more descriptive tags 
    """ 
    text = models.CharField(max_length=1000) 
    tags = GenericRelation(TaggedItem) 

내가 시리얼을 만들어 : 나는 모델을 만들어? 현재 내가

File "/home/aswin/Documents/WebProjects/drf_practice/uni_auth//loginpage/login/serializers.py", line 76, in TaggedItemSerializer 
    tagged_object = TaggedObjectRelatedField() 
    File "/home/aswin/Documents/WebProjects/drf_practice/uni_auth/lib/python3.5/site-packages/rest_framework/relations.py", line 80, in __init__ 
    'Relational field must provide a `queryset` argument, ' 
AssertionError: Relational field must provide a `queryset` argument, override `get_queryset`, or set read_only=`True`. 

으로 오류를 얻고있다 너무 READ_ONLY = 진정한로 인수를주는 시도했지만 내가 정확히 무슨 짓을 넣어 같은 error.just을 던졌다 :

class TaggedItemSerializer(serializers.ModelSerializer): 
    tagged_object = TaggedObjectRelatedField(read_only=True) 

도와주세요 나와 함께이

Answer 1

TaggedItem을 직렬화하는 것에 대해 언급 한 기사에서 아무것도 보이지 않습니다. 왜 TaggedItem을 직렬화 하시겠습니까?

from models import Bookmark, Note, TaggedItem 
from rest_framework import serializers 


class TaggedObjectRelatedField(serializers.RelatedField): 
    def to_representation(self, value): 
     if isinstance(value, Bookmark): 
      serializer = BookMarkSerializer(value) 
     elif isinstance(value, Note): 
      serializer = NoteSerializer(value) 
     else: 
      raise Exception('Unexpected type of tagged object') 

     return serializer.data 


class BookMarkSerializer(serializers.HyperlinkedModelSerializer): 
    tags = TaggedObjectRelatedField(many=True, queryset=TaggedItem.objects.all()) 

    class Meta: 
     model = Bookmark 
     fields = ('pk', 'url', 'tags') 


class NoteSerializer(serializers.HyperlinkedModelSerializer): 
    tags = TaggedObjectRelatedField(many=True, queryset=TaggedItem.objects.all()) 

    class Meta: 
     model = Note 
     fields = ('pk', 'text', 'tags')