Firebase休息API过滤器查询 | Firebase休息API过滤器查询

本文介绍了Firebase休息API过滤器查询的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

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"
  }
}

我使用curl获取请求 https://words-b6651.firebaseio.com/DE-EN.json?orderBy=$ key& print = pretty 我想要获得一个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MongoDB一样执行像$ key。我如何获得这些数据

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

推荐答案

您可以通过属性订购：

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

两个注释：

：indexOn：level

JSON中的项目将处于未确定的顺序，因为JSON本质上是无序的。这意味着在REST API中的排序实际上仅在您也过滤数据时才有用。

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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