如何提取數據快照

Question

我的火力點設置節點的孩子是這樣：

Parent_node:{ 
    Type:{ 
     1476663471800:{ //This is a timestamp = Int64(date.timeIntervalSince1970 * 1000.0) 
      uid: USERS_UID; 
     } 
    } 
} 

我怎麼會訪問用戶的uid？我曾嘗試下面的代碼，但它不是提取UID

self.databaseRef.child("Parent_node/\(Type)").queryLimitedToLast(5).observeEventType(.Value, withBlock: { (snapshot) in 

    print(snapshot) 
    if let userDict = snapshot.value as? [String:AnyObject]{ 
     for each in userDict{ 
      let uidExtraced = each 
      print(uidExtraced) 
      //("1476663471700", [uid: USERS_UID]) 

Answer 1

首先都使用snapshot.value?.allValues得到的值比解析它...

if snapshot.exists() { 
    for value in (snapshot.value?.allValues)!{ 
      print(value) // you get [uid: USERS_UID] here 

      // ... parse it to get USERS_UID 
      print("user_id -- \(value["uid"])") 
     } 
    } 

With this method, order of child might be different. For ordered nodes, you can use snapshot.child