{
  "schema": {
    "bsonType": "object",
    "permission": {
      "create": false,
      "delete": false,
      "read": "auth.uid == doc.user_id",
      "update": false
    },
    "required": [
      "user_id",
      "content"
    ],
    "properties": {
      "_id": {
        "description": "ID，系统自动生成"
      },
      "title":{
      	"description": "标题",
        "bsonType": "string"
      },
      "content":{
      	"description": "内容",
        "bsonType": "string"
      },
      "user_id":{
      	"description": "消息接收者的用户id"
      },
      "create_time":{
      	"description": "创建时间",
      	"forceDefaultValue":{
      		"$env": "now"
      	}
      }
    }
  },
  "index": []
}