Firebase rest API 过滤器查询 [英] Firebase rest API filter query

问题描述

我的数据看起来像

{
  "word0" : {
    "level" : "B2",
    "meaning" : [ "Meaning19", "meaning43" ],
    "type" : "Noun",
    "weight" : 0,
    "word" : "word99"
  },
  "word1" : {
    "level" : "C1",
    "meaning" : [ "Meaning19", "meaning43" ],
    "type" : "Noun",
    "weight" : 0,
    "word" : "word99"
  },
  "word10" : {
    "level" : "A2",
    "meaning" : [ "Meaning19", "meaning43" ],
    "type" : "Noun",
    "weight" : 0,
    "word" : "word99"
  }
}

我正在使用 curl 获取请求 https://words-b6651.firebaseio.com/DE-EN.json?orderBy="$key"&print=pretty 我想获取给定级别的所有单词

i am using curl get request https://words-b6651.firebaseio.com/DE-EN.json?orderBy="$key"&print=pretty and i want to get all words of a given level

是否可以像在 MongoDB 中那样执行 $key."level" 之类的操作?我怎么能得到这些数据

is it possible to do something like $key."level" as in MongoDB ? and how could i get these data

推荐答案

您可以使用以下方法按属性排序:

You can order by a property using:

https://words-b6651.firebaseio.com/DE-EN.json?orderBy="level"&print=pretty

两个注意事项:

• 您需要为您的 Firebase 安全规则添加索引: ".indexOn": "level"

• JSON 中的项目将处于不确定的顺序，因为 JSON 本质上是无序的.这意味着 REST API 中的排序只有在您还过滤数据时才真正有用，例如

• you'll need to add an index to your Firebase security rules: ".indexOn": "level"

• the items in the JSON will be in an undetermined order, since JSON is inherently non-ordered. This means that ordering in the REST API is really only useful when you also filter the data, e.g.

https://words-b6651.firebaseio.com/DE-EN.json?orderBy="level"&equalTo="B2"&print=pretty

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