Question

我正在尝试使用请求中的以下内容将消息发布到数据库：

{
    "thread": 1,
    "content": "lorem ipsum",
    "author": 
    {
        "name":"doc",
        "email":""
    }

}

相反，我收到错误消息＆＃34;无法分配＆＃34; OrderedDict（[（＆＃39; name＆＃39;，doc＆＃39;），（u＆＃39; email＆＃39;，u＆＃39;＆＃39;）]）＆＃34;：＆＃34; Message.author＆＃34;必须是＆＃34;作者＆＃34; 。实例＆＃34;

每条消息都有一个相关的作者记录，可能已经存在，也可能不存在于数据库中。在这一点上，我不介意在那张桌子上重复输入。

我的serializers.py文件包含以下内容：

class AuthorSerializer(serializers.Serializer):
    pk = serializers.IntegerField(read_only=False, required=False)
    name = serializers.CharField(required=True, max_length=50)
    email = serializers.CharField(allow_blank=True, allow_null=True, required=False)

    def create(self, validated_data):
        """
        Create and return a new `Author` instance, given the validated data.
        """
        return Author.objects.create(**validated_data)

    def update(self, instance, validated_data):
        """
        Update and return an existing `Author` instance, given the validated data.
        """
        instance.name = validated_data.get('name', instance.name)
        instance.email = validated_data.get('email', instance.email)
        instance.save()
        return instance

class Meta:
    model = Author
    fields = ('name', 'email')

class MessageSerializer(serializers.Serializer):
    pk = serializers.IntegerField(read_only=True)
    thread = serializers.PrimaryKeyRelatedField(queryset=Thread.objects.all())
    created_at = serializers.DateTimeField(required=False)
    content = serializers.CharField(style={'base_template': 'textarea.html'})
    author = AuthorSerializer(required=False, read_only=False)

    def create(self, validated_data):
        """
        Create and return a new `Message` instance, given the validated data.
        """
        return Message.objects.create(**validated_data)

    def update(self, instance, validated_data):
        """
        Update and return an existing `Message` instance, given the validated data.
        """
        instance.thread = validated_data.get('thread', instance.thread)
        instance.content = validated_data.get('content', instance.content)
        instance.author = validated_data.get('author', instance.author)
        instance.save()
        return instance

    class Meta:
        model = Message
        fields = ('thread', 'created_at', 'content', 'author')

我完全不知道应该如何继续，我是否期望AuthorSerializer能够将列表或有序字典解析为新的或现有的对象。

Answer 1

根据docs，您必须在自定义创建方法中创建嵌套对象：

class MessageSerializer(serializers.Serializer):
    pk = serializers.IntegerField(read_only=True)
    thread = serializers.PrimaryKeyRelatedField(queryset=Thread.objects.all())
    created_at = serializers.DateTimeField(required=False)
    content = serializers.CharField(style={'base_template': 'textarea.html'})
    author = AuthorSerializer(required=False, read_only=False)

    def create(self, validated_data):
        """
        Create and return a new `Message` instance, given the validated data.
        """
        author_data = validated_data.pop('author', None)
        if author_data:
            author = Author.objects.get_or_create(**author_data)[0]
            validated_data['author'] = author
        return Message.objects.create(**validated_data)

在Django Rest Framework中保存相关的嵌套对象

1 个答案: