Realm in Swift

Working on a local storage for persistence in data has a lot of solutions. While we can definitely go ahead and just store String values and play with it, Apple provides some solutions to play with local data as if its a database. The thing is, its not that intuitive. Other solutions are there, but the simplicity of Realm.io is nice and addictive.

Lets see how in swift we could play with Realm.

do {

    // clear the whole DB if Realm throws Errors saying need to migrate
    Realm.Configuration.defaultConfiguration.deleteRealmIfMigrationNeeded = true
    // initiate DB and keep a ref
    self.realm = try Realm()

    // query to get all models of a Particular type
    let pModel = self.realm!.objects(MyModel.self)

    // check for already saved data
    if(pModel.count == 0){
        print("=== No Saved Data Found === XXX ")

        // initiate a Model
        let appInfo:MyModel = MyModel()

        //write a model to DB
        try! self.realm?.write({
            self.realm!.add(appInfo)
        })

    }else{
        print("=== Saved Data Found ===")
        // get the first model 
        let appInfo:MyModel = pModel.first!
    }

} catch let error as NSError {
    print("init : Realm : ERROR :")
    print(error)
}

For writing into the database

public func saveUserId(userId:String,AndPhone:String){

    // get the realm reference we saved above and start interacting with it

    do{

        self.realm?.beginWrite()

        self.pivdModel!.registeredUserId = userId
        self.pivdModel!.registeredMobileNumber = AndPhone

        try self.realm?.commitWrite()

    }catch let error as NSError{
        print(error)
    }

}

Happy coding.