Firebase数据库.indexOn索引配置问题：仅首个子节点生效求助

现有数据节点结构 #

"Apps":{
  "Booster": {
    "ANTBOOSTER": {
      "desc": "",
      "downloads": 30,
      "image": "",
      "tag": "",
      "title": "",
      "upvote": 50,
      "url": ""
    }
  },
  "MoviesnShows": {
    "BeeTv": {
      "H20": true,
      "desc": "",
      "downloads": 11,
      "image": "",
      "tag": "",
      "title": "Bee Tv",
      "upvote": 1,
      "url": ""
    }
  }
}

客户端错误提示 #

Using an unspecified index. Your data will be downloaded and filtered on the client. Consider adding '".indexOn": "upvote"' at Apps/Booster to your security and Firebase Database rules for better performance

该提示同时针对Booster、MoviesnShows等所有父节点，涉及upvote和downloads字段。

当前配置的核心问题 #

你写的规则存在语法嵌套错误，误将Booster节点嵌套在了MoviesnShows节点内部，导致Firebase只会解析到第一个节点的配置，后续节点的规则根本没被正确识别：

"Apps":{
  "MoviesnShows":{
       ".indexOn":["downloads","upvote","H20"],
    
     "Booster":{
       ".indexOn":["downloads","upvote","H20"],

正确的配置方案 #

要把MoviesnShows和Booster作为Apps下的同级节点分别配置索引，同时保证JSON语法完整（闭合所有大括号），正确规则如下：

"Apps": {
  "MoviesnShows": {
    ".indexOn": ["downloads", "upvote", "H20"]
  },
  "Booster": {
    ".indexOn": ["downloads", "upvote", "H20"]
  }
}

关键注意点 #

• 每个需要索引的父节点（比如Booster、MoviesnShows）必须单独在自身节点下配置.indexOn，不能嵌套在其他节点内
• 必须保证JSON语法完全正确，任何未闭合的括号都会导致规则解析中断，后续配置全部失效
• 如果后续Apps下新增其他分类节点，也要按照同样的格式为其添加对应字段的.indexOn配置

内容的提问来源于stack exchange，提问作者Mark Harrop