Question

我正在尝试使用queryEqual（toValue：在swift中。我遇到的问题是我得到了null。

我的数据如下所示

"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"
      }
    }

我希望能够只得到孩子＆＃34; 149791381894099＆＃34;例如。我目前使用的swift中的代码是（抱歉格式化很奇怪）

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

但我用过

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

Answer 1

Firebase的默认排序顺序是优先级。要查询您需要致电queryOrderedByKey()的按键：

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

Firebase queryEqual（toValue：

1 个答案: