Firebase queryEqual(toValue: [英] Firebase queryEqual(toValue:

问题描述

我正在尝试快速使用queryEqual(toValue:.我遇到的问题是我变得空了.

I am trying to using the queryEqual(toValue: in swift. The issue I'm having is that I am getting null.

我的数据看起来像这样

"time" : {
      "149791341619654" : {
        "URL_ID" : "02D03DA8-A652-4EFA-946F-1F0F2A963449",
        "UUID" : "F496B98E-3B4E-4602-B06D-C09B7F42DCB5",
        "date" : 1.497913416196546E9,
        "huer" : 0,
        "latitude" : 32.87926715336076,
        "longitude" : -117.2139702738423,
        "type_" : "Image",
        "uid" : "BjN8usKaW7NhqD2DxPPqAkjhnSx2"
      },
      "149791381894099" : {
        "URL_ID" : "AB8D20E9-D1EB-4FD0-B0A8-CE755D1D8B91",
        "UUID" : "F534E1FC-DC55-4AFB-847D-64B614EF7137",
        "date" : 1.497913818940991E9,
        "huer" : 0,
        "latitude" : 32.87926715336076,
        "longitude" : -117.2139702738423,
        "type_" : "Image",
        "uid" : "BjN8usKaW7NhqD2DxPPqAkjhnSx2"
      },
      "149791881234864" : {
        "URL_ID" : "A3207072-FC64-4A09-87C0-E1340051B140",
        "UUID" : "D0C3FA34-2790-4896-96F7-E0E7C3E17687",
        "date" : 1.497918812348642E9,
        "huer" : 0,
        "latitude" : 32.87915823052905,
        "longitude" : -117.2140478064466,
        "type_" : "Video",
        "uid" : "BjN8usKaW7NhqD2DxPPqAkjhnSx2"
      }
    }

例如，我希望只能获得孩子"149791381894099". 我当前正在使用的快速代码是(很抱歉，格式化表现很奇怪)

I want to be able get only the child "149791381894099" for example. The code in swift I am currently using is (sorry the formatting was acting weird)

self.rootRef.child(uidOtherProfile).child("time").queryEqual(toValue: 149791381894099).observeSingleEvent(of: .value, with: { (snapshot) in})

但是我用过

self.rootRef.child(uidOtherProfile).child("time").queryEqual(toValue: "149791381894099").observeSingleEvent(of: .value, with: { (snapshot) in

推荐答案

Firebase的默认排序顺序是优先的.要查询键，您需要调用queryOrderedByKey():

The default sort order for Firebase is by priority. To query the keys you need to call queryOrderedByKey():

ref.queryOrderedByKey().queryEqual(toValue: "149791381894099").observe(.childAdded, with: { (snapshot) in
    print(snapshot)
})

这篇关于Firebase queryEqual(toValue:的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！