序列化程序 returns 对象而不是字段

Question

使用 Django 2.1/Django Rest 框架。

我正在接收 DRF 的模型对象输出，而不是实际字段。

我想收到 audio_links 和 release_artists 表格的所有项目。

这是我的。

输出

{ "title": "Attack The Dancefloor Volume Two", "audiolinks": [ "AudioLinks object (55708)", "AudioLinks object (55709)", "AudioLinks object (55710)", "AudioLinks object (55711)" ], "releaseartists": [ "ReleaseArtists object (140)", "ReleaseArtists object (141)" ] }

models.py

class AudioLinks(models.Model):
    release = models.ForeignKey('ReleasesAll', models.DO_NOTHING, db_column='release_id', related_name='audiolinks')
    track_number = models.IntegerField()
    class Meta:
        managed = False
        db_table = 'audio_links'

class ReleaseArtists(models.Model):
    release = models.ForeignKey('ReleasesAll', models.DO_NOTHING, db_column='release_id', related_name='releaseartists')
    artists = models.CharField(max_length=100)

    class Meta:
        managed = False
        db_table = 'release_artists'

views.py

class ListReleaseDetailView(generics.RetrieveUpdateDestroyAPIView):

    queryset = ReleasesAll.objects.all()
    serializer_class = ReleasesSerializer
    def get(self, request, *args, **kwargs):
        try:
            a_release = self.queryset.prefetch_related('releaseartists','audiolinks').get(pk=kwargs['release_id'])
            return Response(ReleasesSerializer(a_release).data)

        except ReleasesAll.DoesNotExist:
            return Response(
                data = {
                    "message": "{} does not exist".format(kwargs["release_id"])
                },
                status=status.HTTP_404_NOT_FOUND
            )

serializers.py

class ReleasesSerializer(serializers.ModelSerializer):
    audiolinks = serializers.StringRelatedField(many=True)
    releaseartists = serializers.StringRelatedField(many=True)

    class Meta:
        model = ReleasesAll
        fields = ('title','audiolinks','releaseartists')

Answer 1

serializers.stringRelatedField 给出模型上定义的 __str__ 方法的输出。

因此你得到这个“AudioLinks object (55708)”和 ReleaseArtists object (141)，这是任何模型的默认 __str__ 表示。

为了获取所有字段，您必须为与所需字段相关的每个其他模型定义序列化程序，例如：

class AudioLinksSerializer(serializers.ModelSerializer):
    class Meta:
        model = AudioLinks
        fields = ('__all__')

class ReleaseArtistsSerializer(serializers.ModelSerializer):
    audiolinks = serializers.StringRelatedField(many=True)
    releaseartists = serializers.StringRelatedField(many=True)

    class Meta:
        model = ReleaseArtists
        fields = ('__all__')

然后：

class ReleasesSerializer(serializers.ModelSerializer):
    audiolinks = AudioLinksSerializer(many=True)
    releaseartists = ReleaseArtistsSerializer(many=True)

    class Meta:
        model = ReleasesAll
        fields = ('title','audiolinks','releaseartists')

这足以让您获取所有字段。

***而且根据 Django 惯例，您需要以单数形式命名模型，即 AudioLink、ReleaseArtist。这样您就可以将模型视为单个对象。当您尝试获得 audiolinks 时会更容易，因为您会想 "there are many AudioLink objects and I am getting few of them"

序列化程序 returns 对象而不是字段

Serializer returns object instead fields

django

django-models

django-views

django-serializer

django-rest-framework