如何快速解析Firebase FDatasnapshot json数据 [英] how parsing Firebase FDatasnapshot json data in swift

问题描述

从Firebase获取数据时遇到问题.

I'm having issue getting data from Firebase.

模式是

{
    title: "dog",
    images: {
        main: "dog.png",
        others: {
            0: "1.png",
            1: "2.png",
            2: "3.png"
        }
    }
}

如何将FDataSnapshot解析为快速模型?

how can i parse FDataSnapshot to swift model??

推荐答案

Firebase是NoSQL JSON数据库，没有架构和表.数据以带有节点的树"结构存储；父母和孩子.

Firebase is a NoSQL JSON database and has no schema and no tables. Data is stored with a 'tree' structure with nodes; parents and children.

您无需解析Firebase JSON数据即可访问它，您可以直接访问它.

You don't need to parse Firebase JSON data to access it, you can access it directly.

FDataSnapshots包含一个.key，它是Firebase和.value中的父键. .Value可以包含一个节点，也可以包含多个节点.该值将具有key:value对，代表快照中的数据

FDataSnapshots contain a .key, which is it's parent key in Firebase and .value. .Value may contain one node, or multiple nodes. The Value will have key:value pairs representing the data within the snapshot

因此，在您的示例中，您将具有这样的Firebase结构

So for your example you will have a Firebase structure like this

dogs
  dog_id_0
    title: "dog"
    type: "Alaskan Malamute"
    images:
        main: "dog.png"
        others:
            0: "1.png"
            1: "2.png"
  dog_id_1
    title: "another dog"
    type: "Boxer"
    images:
        main: "another_dog.png"
        others:
            0: "3.png"
            1: "4.png"

因此，假设您想一次在每个dog_id_x节点中读取一个并打印一些值.

So, say you want to read in each dog_id_x node one at a time and print some values.

var ref = Firebase(url:"https://your-app.firebaseio.com/dogs")

ref.observeEventType(.ChildAdded, withBlock: { snapshot in
    println(snapshot.value.objectForKey("title"))
    println(snapshot.value.objectForKey("type"))
})

这将输出

dog
Alaskan Malamute
another dog
Boxer

dog_id_0和dog_id_1是使用Firebase childByAutoId创建的节点名称.

The dog_id_0 and dog_id_1 are node names created with the Firebase childByAutoId.

您可以轻松地创建一个Dog类，然后将其传递给FDataSnapshot，该FDataSnapshot将根据快照中的数据填充该类.

You could just as easily create a Dog class, and pass it the FDataSnapshot which will populate the class from the data within the snapshot.

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