{
  "bsonType": "object",
  "required": ["price"], // 添加 price 为必填字段
  "permission": {
    "read": true,
    "create": "'admin' in auth.role",
    "update": "'admin' in auth.role",
    "delete": "'admin' in auth.role"
  },
  "properties": {
    "_id": {
      "description": "ID，系统自动生成"
    },
    "url": {
      "bsonType": "string",
      "title": "资源地址",
      "description": "带签名时效的静态资源 URL",
      "trim": "both",
      "pattern": "^https?://", // 基础 URL 格式校验
      "errorMessage": {
        "format": "URL 必须以 http/https 开头"
      }
    },
    "price": {
      "bsonType": "int",
      "title": "商品价格",
      "description": "单位：分（整数类型）",
      "minimum": 0,
      "maximum": 100000000,
      "errorMessage": {
        "type": "价格必须为整数类型",
        "minimum": "价格不能为负数",
        "maximum": "单件商品价格不得超过100万元"
      }
    }
  }
}