添加"forceDefaultValue": { "$env": "uid"}后，新增失败

错误提示： “未能获取当前用户信息：30205 | 当前用户为匿名身份”
新增操作：

this.form = {  
    type:'work',  
    title:'标题'，  
    content:'测试'，  
}  
db.collection('note').add(this.form);

node.schema.json

{  
    "bsonType": "object",  
    "required": [],  
    "permission": {  
        "read": true,  
        "create": true,  
        "update": true,  
        "delete": true  
    },  
    "properties": {  
        "_id": {  
            "description": "ID，系统自动生成"  
        },  
        "type": {  
            "description": "类型，work：工作，live：生活"  
        },  
        "title": {  
            "description": "标题"  
        },  
        "content": {  
            "description": "内容"  
        },  
        "user_id": {  
            "description": "创建人",  
            "forceDefaultValue": {  
                "$env": "uid"  
            }  
        }  
    }  
}