Realm

Realm is a fast, scalable alternative to SQLite with mobile to cloud data sync that makes building real-time, reactive mobile apps easy.

Realm

• Base de dades nosql per aplicacions
• Permet la sincronització amb Atlas MongoDB

Gradle

plugins {
    (...)
    id("io.realm.kotlin") version "1.5.0"
}

implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0")
implementation("io.realm.kotlin:library-sync:1.5.0")

• Assegurat usar Kotlin 1.7.21

Model

open class Item(
        @PrimaryKey
        var _id: ObjectId = ObjectId.create(),
        var complete: Boolean = false,
        var summary: String = "",
        var owner_id: String = ""
) : RealmObject {
        // Declaring empty contructor
        constructor() : this(owner_id = "") {}
        //var doAfter: RealmList<Item>? = realmListOf()
        override fun toString() = "Item($_id, $summary)"
}

Configuració només local

val config = RealmConfiguration.Builder(setOf(Item::class))
    .deleteRealmIfMigrationNeeded()
    // .directory("customPath")
    .build()
println("Realm Path: ${config.path}")
val realm = Realm.open(config)

Insertar

realm.writeBlocking {
    val item = Item(summary = "Some summary ${Date()}"
        // doAfter = query<Item>().find().take(2).toRealmList()
    )
    copyToRealm(item)
}

Consultar

val items = realm.query<Item>().find()
items.forEach { println(it.summary) }

Consultar - Flow

realm.query<Item>().find().asFlow().collect{
    println(it.list.map{it.summary})
    println()
}
launch {
    repeat(3){
        realm.writeBlocking {
            val item = Item(summary = "Local Only Some summary ${Date()}")
            copyToRealm(item)
        }
        delay(5000)
    }
    realm.close()
}