oogatta

// ☁️ Admin node
//    JS だけ value ではソートが効かないのはバグか仕様か
admin.database().ref().child("test").child("Admin")
    .orderByChild("fuga") // ソートキー
    .on("child_added", snapshot => {
        console.log(`(${snapshot.val().hoge}, ${snapshot.val().fuga})`);
    });

    
// 🍎 iOS Swift

oogatta

// ☁️ Admin node
admin.database().ref().child("test").child("Admin")
    .orderByKey()   // キーでソート
    .limitToLast(3) // 切り取る範囲
    .once("value", snapshot => {
        Object.values(snapshot.val()).forEach(value => {
            console.log(`(${value.hoge}, ${value.fuga})`);
        });
    });
    

oogatta

// ☁️ Admin node
admin.database().ref().child("test").child("Admin")
    .orderByKey()    // キーでソート
    .limitToFirst(3) // 切り取る範囲
    .once("value", snapshot => {
        Object.values(snapshot.val()).forEach(value => {
            console.log(`(${value.hoge}, ${value.fuga})`);
        });
    });
    

oogatta

// ☁️ Admin node
admin.database().ref().child("test").child("Admin")
    .orderByKey() // キーでソート
    .once("value", snapshot => {
        Object.values(snapshot.val()).forEach(value => {
            console.log(`(${value.hoge}, ${value.fuga})`);
        });
    });

// 🍎 iOS Swift

oogatta

// ☁️ Admin node
admin.database().ref().child("test").child("Admin")
    .once("value", snapshot => {
        Object.values(snapshot.val()).forEach(value => {
            console.log(`(${value.hoge}, ${value.fuga})`);
        });
    });

// 🍎 iOS Swift
Database.database().reference().child("test").child("iOS")

oogatta

FirebaseDatabase.getInstance().reference.child("test").child("Android").apply {
    setValue(null)
    push().setValue(mapOf("hoge" to 1, "fuga" to 5))
    push().setValue(mapOf("hoge" to 2, "fuga" to 4))
    push().setValue(mapOf("hoge" to 3, "fuga" to 3))
    push().setValue(mapOf("hoge" to 4, "fuga" to 2))
    push().setValue(mapOf("hoge" to 5, "fuga" to 1))
}

oogatta

let targetReference = Database.database().reference().child("test").child("iOS")
targetReference.setValue(nil)
targetReference.childByAutoId().setValue(["hoge": 1, "fuga": 5])
targetReference.childByAutoId().setValue(["hoge": 2, "fuga": 4])
targetReference.childByAutoId().setValue(["hoge": 3, "fuga": 3])
targetReference.childByAutoId().setValue(["hoge": 4, "fuga": 2])
targetReference.childByAutoId().setValue(["hoge": 5, "fuga": 1])

oogatta

with (admin.database().ref().child("test").child("Admin")) {
    set(null);
    push().set({"hoge": 1, "fuga": 5});
    push().set({"hoge": 2, "fuga": 4});
    push().set({"hoge": 3, "fuga": 3});
    push().set({"hoge": 4, "fuga": 2});
    push().set({"hoge": 5, "fuga": 1});
}

oogatta

class MainActivity : AppCompatActivity() {
    val controller = MySweetController()
    var vmList = arrayListOf<MySweetViewModelable>()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        vmList.add(TitleViewModel("Hello, Ebisu!"))
        // ...
        my_sweet_recycler_view.adapter = controller.adapter
        updateController()

oogatta

class MainActivity : AppCompatActivity() {
    lateinit var adapter: RecyclerView.Adapter<RecyclerView.ViewHolder>
    var vmList = arrayListOf<MySweetViewModelable>()
    override fun onCreate(savedInstanceState: Bundle?) {
        // Title
        vmList.add(TitleViewModel("Hello, Ebisu!"))
// ...
        adapter = MySweetAdapter(vmList)
        my_sweet_recycler_view.adapter = adapter
    }