{ "bsonType": "object", "required": ["value", "expired"], "permission": { "read": false, "create": false, "update": false, "delete": false }, "properties": { "_id": { "description": "ID,系统自动生成" }, "value": { "description": "值" }, "expired": { "description": "过期时间", "bsonType": "timestamp" } } }