问根据分配的键查询数据库

EN

{
  "Site-List" : {
    "1" : {
      "address" : "test1",
      "latitude" : 0,
      "live" : false,
      "longitude" : 0,
      "siteName" : "Test1"
    },
    "2" : {
      "address" : "test2",
      "latitude" : 0,
      "live" : false,
      "longitude" : 0,
      "siteName" : "Test2"
    }
  }
}

var sites: [SiteList] = []

findSite("1")
print(sites)

func findSite(id: String)  {
    let ref = Database.database().reference().child("Site-List")

    ref.observe(.value, with:{ (snapshot: DataSnapshot) in
        var newItems: [SiteList] = []
        for child in snapshot.children {
            if let snapshot = child as? DataSnapshot,
                let siteList = SiteList(snapshot: snapshot) {
                for site in siteList.key {
                    if String(site) == "1" {
                        newItems.append(siteList)
                    }
                }
            }
        }
        self.sites = newItems
    })
}