{
  "schema": {
    "bsonType": "object",
    "permission": {
      "create": false,
      "delete": false,
      "read": "auth.uid == doc.to_uid || auth.uid == doc.from_uid",
      "update": false
    },
    "required": [
      "to_uid",
      "body",
      "type"
    ],
    "properties": {
      "_id": {
        "description": "ID，系统自动生成"
      },
      "from_uid": {
        "bsonType": "string",
        "description": "消息发送方 UserID（用于指定发送消息方帐号）",
        "forceDefaultValue": {
          "$env": "uid"
        }
      },
      "to_uid": {
        "bsonType": "string",
        "description": "消息接收方 UserID"
      },
      "group_id": {
        "bsonType": "string",
        "description": "group_id即消息接收群的id"
      },
      "body": {
        "description": "消息内容，包含的键会随type变化。需要自己写valedateFunction验证"
      },
      "is_read": {
        "bsonType": "bool",
        "description": "是否已读",
        "forceDefaultValue": false
      },
      "type": {
        "bsonType": "string",
        "enum": [{
            "text": "文本",
            "value": "text"
          },
          {
            "text": "图像",
            "value": "image"
          },
          {
            "text": "语音",
            "value": "sound"
          },
          {
            "text": "视频",
            "value": "video"
          },
          {
            "text": "文件",
            "value": "file"
          },
          {
            "text": "位置",
            "value": "location"
          }
        ]
      },
      "create_time": {
        "bsonType": "timestamp",
        "description": "消息发送时间戳",
        "forceDefaultValue": {
          "$env": "now"
        }
      },
      "client_create_time": {
        "bsonType": "timestamp",
        "description": "客户端创建消息的时间戳",
        "forceDefaultValue": {
          "$env": "now"
        }
      }
    }
  },
  "index": []
}