[英]How do I use GenericRelation with Django Rest Framework?
[英]Django Rest Framework (DRF) how to get value of GenericRelation field?
在我的 models.py 中,我有一個“電影”model,其字段設置如下:
video_stream_relation = GenericRelation(VideoStreamInfo, related_query_name='video_stream_relation')
此 GenericRelation 字段指向以下 model class:
class VideoStreamInfo(models.Model):
objects = RandomManager()
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
content_type = models.ForeignKey(ContentType, limit_choices_to=referential_stream_models, on_delete=models.CASCADE, verbose_name=_("Content Type"))
object_id = models.CharField(max_length=36, verbose_name=_("Object ID"))
content_object = GenericForeignKey('content_type', 'object_id')
index = models.IntegerField(verbose_name=_("Stream Index"), blank=False)
bit_rate = models.IntegerField(verbose_name=_("Bitrate (bps)"), blank=True, null=True, editable=False)
codec_name = models.CharField(verbose_name=_("Codec Name"), blank=True, null=True, editable=False, max_length=255)
width = models.IntegerField(verbose_name=_("Width"), blank=True, null=True, editable=False)
height = models.IntegerField(verbose_name=_("Height"), blank=True, null=True, editable=False)
date_added = models.DateTimeField(auto_now_add=True, verbose_name=_("Date Added"))
現在的問題是如何在 ModelSerializer 中獲取 video_stream_relation.codec_name 值,如下所示:
class MovieSerializer(serializers.ModelSerializer):
id = serializers.PrimaryKeyRelatedField(queryset=Movies.objects.all())
class Meta:
model = Movies
fields = ('id',
...)
我希望能夠將 codec_name 顯示為 API JsonResponse。
如果需要,這就是我的 API 視圖當前的樣子:
@api_view(['GET',])
@authentication_classes([JSONWebTokenAuthentication])
@permission_classes([AllowAny])
def movies(request):
if request.method == 'GET':
obj = Movies.objects.all()
serializer = MovieSerializer(obj, many=True)
return JsonResponse(serializer.data, safe=False)
如果我嘗試將 video_stream_relation 字段添加到我的 MovieSerializer,我會返回以下錯誤:
類型錯誤:GenericRelatedObjectManager 類型的 Object 不是 JSON 可序列化
提前致謝。
您可以為VideoStreamInfo
創建一個 model 序列化程序,並在MovieSerializer
其用作相關管理器,如下所示:
from rest_framework import serializers
class VideoStreamInfoSerializer(serializers.ModelSerializer):
class Meta:
model = VideoStreamInfo
fields = ('codec_name', )
class MovieSerializer(serializers.ModelSerializer):
video_stream_relation = VideoStreamInfoSerializer(many=True, read_only=True)
id = serializers.PrimaryKeyRelatedField(queryset=Movies.objects.all())
class Meta:
model = Movies
fields = ('id',
'video_stream_relation',
...
)
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