CODEWITHSUNDEEP
iosswift3realmobjectmapper
Kirit Vaghela
Kirit Vaghela

Reputation: 12664

Can not use realm with object mapper swift 3.0

I'm using Realm with Object Mapper for JSON Parsing. When I create a model class that Use both Object Mapper and Realm than I get compilation error

error:must call a designated initializer of the superclass 'QuestionSet'

import ObjectMapper
import RealmSwift

class QuestionSet: Object, Mappable {

    //MARK:- Properties
    dynamic var id:Int = 0
    dynamic var title:String?
    dynamic var shortTitle:String?
    dynamic var desc:String?
    dynamic var isOriginalExam:Bool = false
    dynamic var isMCQ:Bool = false
    dynamic var url:String?

    //Impl. of Mappable protocol
    required convenience init?(map: Map) {
        self.init()
    }

    //mapping the json keys with properties
    public func mapping(map: Map) {
        id          <- map["id"]
        title       <- map["title"]
        shortTitle  <- map["short_title"]
        desc        <- map["description"]
        isMCQ   <- map["mc"]
        url     <- map["url"]
        isOriginalExam <- map["original_pruefung"]
    }
}

if I use super.init() in init method than I get the compilation error

Case 1:

//Impl. of Mappable protocol
 required convenience init?(map: Map) {
    self.init()
}

error:must call a designated initializer of the superclass 'QuestionSet'

Case 2:

 //Impl. of Mappable protocol
 required convenience init?(map: Map) {
    super.init()
}

Convenience initializer for 'QuestionSet' must delegate (with 'self.init') rather than chaining to a superclass initializer (with 'super.init')

Case 3:

//Impl. of Mappable protocol
 required convenience init?(map: Map) {
    super.init()
    self.init()
}

error 1: must call a designated initializer of the superclass 'QuestionSet'

Initializer cannot both delegate ('self.init') and chain to a superclass initializer ('super.init')

Convenience initializer for 'QuestionSet' must delegate (with 'self.init') rather than chaining to a superclass initializer (with 'super.init')

Upvotes: 3

Views: 967

Answers (1)

dmorrow
dmorrow

Reputation: 5664

I use this pattern:

I have a BaseObject that all my Realm objects inherit from

open class BaseObject: Object, StaticMappable {

    public class func objectForMapping(map: Map) -> BaseMappable? {
        return self.init()
    }

    public func mapping(map: Map) {
        //for subclasses
    }
 }

Then your class would look like this:

import ObjectMapper
import RealmSwift

class QuestionSet: BaseObject {

    //MARK:- Properties
    dynamic var id:Int = 0
    dynamic var title:String?
    dynamic var shortTitle:String?
    dynamic var desc:String?
    dynamic var isOriginalExam:Bool = false
    dynamic var isMCQ:Bool = false
    dynamic var url:String?

    //mapping the json keys with properties
    public func mapping(map: Map) {
        id          <- map["id"]
        title       <- map["title"]
        shortTitle  <- map["short_title"]
        desc        <- map["description"]
        isMCQ   <- map["mc"]
        url     <- map["url"]
        isOriginalExam <- map["original_pruefung"]
    }
}

Upvotes: 2

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