Firebase其余API过滤查询

Question

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 get request https://words-b6651.firebaseio.com/DE-EN.json?orderBy="$key"&print=pretty,我想获得给定级别的所有单词

是否有可能像在MongoDB中那样使用$ key."level".我怎么能得到这些数据

Answer 1

您可以通过以下方式订购物业:

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

两个笔记:

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

• 由于JSON本质上是非有序的,因此JSON中的项目将处于未确定的顺序.这意味着REST API中的排序仅在您过滤数据时才有用,例如

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