从数组值中查找Firebase子级-xcode 8/swift 3

Question

如果snapshot.Value为“Pending”，我希望获得一个以snapshot.Key作为UID的快照。将其存储到数组中。然后，我将遍历UID数组，并从。child（“users”）中提取所有细节，即“email”、“name”和“profileurl”。不知道这里最好的路线是什么。我是将快照存储到字典中，然后将字典筛选为“挂起”，还是在快照调用本身中执行此操作？

Firebase数据库中的friends&users JSON结构（如下所示；）

{
  "friends" : {
    "YPQYLtXnMbbmFugrJJPYe6rOIJg2" : {
      "Z6PnyFKSR9MBMd9dfCEs0VMIOog2" : "pending"
    },
    "Z6PnyFKSR9MBMd9dfCEs0VMIOog2" : {
      "YPQYLtXnMbbmFugrJJPYe6rOIJg2" : "pending",
      "ZyAV7PH4VHWnLyWrWaZty5C9RWT2" : "pending",
      "lNI9FxCErqMUNiW43yiDpkNoljg1" : "pending"
    },
    "ZyAV7PH4VHWnLyWrWaZty5C9RWT2" : {
      "Z6PnyFKSR9MBMd9dfCEs0VMIOog2" : "pending"
    },
    "lNI9FxCErqMUNiW43yiDpkNoljg1" : {
      "Z6PnyFKSR9MBMd9dfCEs0VMIOog2" : "pending"
    }
  },
  "users" : {
    "YPQYLtXnMbbmFugrJJPYe6rOIJg2" : {
      "email" : "[e-mail]",
      "name" : "Karen Alaedidibgghi Liangescu",
      "profileURL" : "someURL"
    },
    "Z6PnyFKSR9MBMd9dfCEs0VMIOog2" : {
      "email" : "[e-mail]",
      "name" : "Patricia Alaefhcbebjid Warmansen",
      "profileURL" : “someURL”
    },
    "ZyAV7PH4VHWnLyWrWaZty5C9RWT2" : {
      "email" : "[e-mail]",
      "name" : "Harry Alaeejdjagjga Greenestein",
      "profileURL" : "someURL"
    },
    "lNI9FxCErqMUNiW43yiDpkNoljg1" : {
      "email" : "[e-mail]",
      "name" : "Maria Alaefehgadbdg Valtchanovsky",
      "profileURL" : "someURL"
    }
  }
}

Answer 1

以下是开始的方法，一旦有了解析的数据，就可以使用不同的方法对其进行过滤，可以通过过去回答的不同stackoverflow问题查找这些方法。

let dbRef = FIRDatabase.database().reference.child("friends")
dbRef.observeSingleEvent(of: .value, with: { snapshot in
    if let data = snapshot.value as? [String: [String: String]] {
        for user in data {
            // You'll now have a dictionary with neatly formatted values you can filter
        }
    }
})