{
	"schema": {
		"bsonType": "object",
		"required": ["to_uid", "body", "type"],
		"permission": {
			"read": "auth.uid == doc.to_uid",
			"create": true,
			"update": false,
			"delete": false
		},
		"properties": {
			"_id": {
				"description": "ID，系统自动生成"
			},
			"from_uid": {
				"description": "消息发送方 UserID（用于指定发送消息方帐号）",
				"forceDefaultValue": {
					"$env": "uid"
				}
			},
			"to_uid": {
				"description": "消息接收方 UserID",
				"bsonType": "string"
			},
			"is_read": {
				"description": "是否已读",
				"bsonType": "bool",
				"forceDefaultValue": false
			},
			"create_date": {
				"description": "消息发送时间戳",
				"forceDefaultValue": {
					"$env": "now"
				}
			},
			"body": {
				"bsonType": "object",
				"description": "消息内容，包含的键会随type变化。需要自己写valedateFunction验证"
			},
			"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"
				}]
			}
		}
	},
	"index": []
}