[英]How to serialize a list of objects?
Django-Rest-Framework 文档 ( https://www.django-rest-framework.org/api-guide/serializers/ ) 提供了以下用于序列化对象列表的示例:
queryset = Book.objects.all()
serializer = BookSerializer(queryset, many=True)
serializer.data
我尝试使用以下代码执行类似操作:
@api_view(['GET'])
def postComments(request, pk):
"""
Retrieve all comments with originalPostId = pk.
"""
if request.method == 'GET':
comments = Comment.objects.all()
comments = comments.filter(originalPostId = pk)
serializer = CommentSerializer(comments, many=True)
if serializer.is_valid():
return Response(serializer.data)
logger.error(serializer.errors)
但是,立即出现以下错误: AssertionError: Cannot call `.is_valid()` as no `data=` keyword argument was passed when instantiating the serializer instance.
另一篇文章( django-rest-framework:无法调用`.is_valid()`,因为在实例化序列化器实例时没有传递`data=`关键字参数)似乎解决了这个问题,但答案表明在调用时放入data=
我的CommentSerializer
将用于反序列化而不是序列化,这不是我想要的。
但是,当我使用serializer = CommentSerializer(data=comments, many=True)
行运行时serializer = CommentSerializer(data=comments, many=True)
我收到错误{'non_field_errors': [ErrorDetail(string='Expected a list of items but got type "QuerySet".', code='not_a_list')]}
这是我的序列化程序,以防万一:
poster = UserSerializer()
community = CommunitySerializer()
originalPost = PostSerializer()
class Meta:
model = Comment
fields = ['post', 'community', 'poster', 'originalPost', 'originalPostId']
def create(self, validated_data):
userData = validated_data.pop('poster')
user = User.objects.get_or_create(username=userData['username'],
email=userData['email'],
first_name=userData['first_name'],
last_name=userData['last_name'],
password=userData['password'])[0]
validated_data['poster'] = user
communityData = validated_data.pop('community')
community = Community.objects.get_or_create(name=communityData['name'])[0]
validated_data['community'] = community
originalPostData = validated_data.pop('originalPost')
originalPost = Post.objects.get_or_create(id = validated_data['originalPostId'])[0]
validated_data['originalPost'] = originalPost
comment = Comment.objects.create(**validated_data)
return comment```
@api_view(['GET'])
def postComments(request, pk):
"""
Retrieve all comments with originalPostId = pk.
"""
if request.method == 'GET':
comments = Comment.objects.all()
comments = comments.filter(originalPostId = pk)
serializer = CommentSerializer(comments, many=True)
return Response(serializer.data)
摆脱is_valid()
检查使它起作用。 我想我只需要相信自己吧~
is_valid 用于验证用户输入数据,因此无需调用 is_valid。
@api_view(['GET'])
def postComments(request, pk):
"""
Retrieve all comments with originalPostId = pk.
"""
if request.method == 'GET':
comments = Comment.objects.filter(originalPostId = pk).all()
serializer = CommentSerializer(comments, many=True)
return Response(serializer.data)
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