SlugRelatedField 查询集

我正在努力找出 SlugRelatedField 的查询集。 我的数据是这样的，我有一堆Object属于 a 的实例Project。一个项目有一个独特的“顶”Object. Object仅当它们位于不同的下面时才可以具有相同的名称Projects.

class Object(models.Model):
    project = models.ForeignKey('Project', null=False, related_name='objs')
    name = models.TextField(null=False, db_index=True)
    ....
    class Meta:
        index_together = unique_together = ('project', 'name')

class Project(models.Model):
    user = models.ForeignKey(get_user_model(), null=False, related_name='+')
    name = models.TextField(null=False)
    top = models.OneToOneField(Object, null=True, related_name='+')
    ....

class ObjectSerializer(NonNullSerializer):
    class Meta:
        model = Object
        fields = ('name',)

class ProjectSerializer(NonNullSerializer):
    objs = ObjectSerializer(many=True, required=False)
    top = serializers.SlugRelatedField(slug_field='name', queryset=Object.objects.filter(????))

    class Meta:
        model = Project
        fields = ('id', 'name', 'objs', 'top')

我的查询集会是什么样子top如果我只想找到一个Object那属于正确的Project？换句话说，如何反序列化：

[{
    'name' : 'Project1',
    'objs' : [{
        'name': 'One'
    }],
    'top': 'One'
},
{
    'name' : 'Project2',
    'objs' : [{
        'name': 'One'
    }],
    'top': 'One'     <-- This should point to One under Project2, not One under Project1
}]

当我被带回到这里时，我只是重新审视我自己关于这个主题的问题，所以这是实现这一目标的方法（我认为）。

class ObjectSerializer(NonNullSerializer):
    class Meta:
        model = Object
        fields = ('name',)

class TopSerializerField(SlugRelatedField):
    def get_queryset(self):
        queryset = self.queryset
        if hasattr(self.root, 'project_id'):
            queryset = queryset.filter(project_id=project_id)
        return queryset

class ProjectSerializer(NonNullSerializer):

    def __init__(self, *args, **kwargs):
        self.project_id = kwargs.pop('project_id')
        super().__init__(*args, **kwargs)

    # I've needed this workaround for some cases...
    # def __new__(cls, *args, **kwargs):
    #    """When `many=True` is provided then we need to attach the project_id attribute to the ListSerializer instance"""
    #    project_id = kwargs.get('project_id')
    #    serializer = super(ProjectSerializer, cls).__new__(cls, *args, **kwargs)
    #    setattr(serializer, 'project_id', project_id)
    #    return serializer

    objs = ObjectSerializer(many=True, required=False)
    top = TopSerializerField(slug_field='name', queryset=Object.objects.all())

    class Meta:
        model = Project
        fields = ('id', 'name', 'objs', 'top')

当您反序列化数据时，它将搜索属于序列化器上定义的正确项目的对象。